Question:  A Girl like Me is the second studio album by Barbadian singer Rihanna, who worked with Evan Rogers, Carl Sturken, StarGate, J. R. Rotem and label-mate Ne-Yo, who wrote the album's second single,  "Unfaithful" , written by who?

full_context: Document 1: List of songs recorded by Rihanna: Barbadian singer Rihanna has recorded material for her eight studio albums and has collaborated with other artists for duets and featured songs on their respective albums and charity singles. After signing a record contract with the Def Jam Recordings in February 2005, Rihanna began to work with producers Carl Sturken and Evan Rogers, who co-wrote and co-produced 12 out of the 15 songs on her 2005 debut album, "Music of the Sun". Award-winning songwriter Diane Warren co-wrote the title track, while Grammy Award-winning singer-songwriter Deniece Williams co-wrote the song "Willing to Wait". Sturken and Rogers co-wrote and co-produced 9 songs out of 16 on Rihanna's 2006 album "A Girl like Me". The album's lead single "SOS" was written by Evan "Kidd" Bogart and J. R. Rotem. It contains a sped-up sample of "Tainted Love", written in 1965 by Ed Cobb, who was credited as a co-writer on "SOS".
Document 2: List of Rihanna concert tours: Barbadian recording artist Rihanna has embarked on four concert tours, three of which have been worldwide. Her 2006 debut, was based in North America only and supported her first and second studio album, "Music of the Sun" (2005) and "A Girl like Me" (2006). The tour lasted for three months, through which Rihanna performed 36 shows. The same year, Rihanna continued to tour as a special guest on the PCD World Tour with Pussycat Dolls, Roc the Block Tour with Jay-Z and Ne-Yo, and the Monkey Business Tour with Black Eyed Peas. In the period from 2007 till 2009, she performed on the worldwide Good Girl Gone Bad Tour in a support of her third studio album with same name. During the tour, Rihanna visited Europe, North America, Oceania, Asia and Africa. It featured Rihanna presenting completely different style and wearing leather outfits. The Good Girl Gone Bad Tour sparked controversy in Malaysia where the Pan-Malaysian Islamic Party recommended that Rihanna's concert tour should be banned due her provocative outfits. A DVD, titled "Good Girl Gone Bad Live" was released on June 16, 2008. It features the show from Evening News Arena in Manchester, England, held on December 6, 2007.
Document 3: Rihanna videography: Barbadian singer Rihanna has released four video albums and appeared in fifty-two music videos, six films, ten television programs, and eight television commercials. In 2005, Rihanna signed a recording contract with Def Jam Recordings and released her debut single "Pon de Replay", taken from her first studio album "Music of the Sun" (2005). Like its lyrical theme, the music video for the song was inspired by disco and dance; it was directed by Little X. Three separate videos were released for "SOS", the lead single from her second studio album "A Girl Like Me" (2006), all of which contained various dance sequences. The same year, American director Anthony Mandler directed the accompanying music video for the second single "Unfaithful", which featured Rihanna in a dangerous love triangle with her lover and her husband. "Unfaithful" was Rihanna's first collaboration with Mandler; they later worked together regularly. Also in 2006, Rihanna played herself in the third installment of the "Bring It On" film series, entitled "".
Document 4: A Girl like Me (Rihanna album): A Girl like Me is the second studio album by Barbadian singer Rihanna. It was released on April 10, 2006 by Def Jam Recordings. For the production of the album, Rihanna worked with Evan Rogers, Carl Sturken, StarGate, J. R. Rotem and label-mate Ne-Yo, who wrote the album's second single. "A Girl like Me" is a pop, reggae and R&B album influenced by Rihanna's Caribbean roots. The album also incorporates elements of dancehall and rock, as well as ballads, which music critics were ambivalent towards.
Document 5: Roc Me Out: "Roc Me Out" is a song recorded by Barbadian recording artist Rihanna for her sixth studio album "Talk That Talk" (2011). It was written by Ester Dean, Robert Swire, Gareth McGrillen, Mikkel S. Eriksen and Tor Erik Hermansen. The track was produced by StarGate (Eriksen and Hermansen) and Knife Party (Swire and McGrillen). "Roc Me Out" is a synthpop-influenced R&B song reminiscent of Rihanna's previous singles "Rude Boy" and "S&M". It is set in "chugging" tempo and features heavy synths, "contagious" hooks and West Indian nuances. Lyrically, the song features Rihanna sexually seducing her lover, while revealing her "nasty secrets". Contemporary music critics were divided in their reviews of "Roc Me Out"; some of them labeled the song as a highlight on the album, while others criticized its similarity to Rihanna's previous singles. Upon the release of "Talk That Talk", the song debuted on the lower regions of the singles charts in South Korea and the United Kingdom at number 73 and 176 respectively.
Document 6: Hate That I Love You: "Hate That I Love You" is a song recorded by Barbadian singer Rihanna for her third studio album, "Good Girl Gone Bad" (2007). It features vocals by American singer and songwriter Ne-Yo, who co-wrote the song with its producers StarGate. Def Jam Recordings released the song on August 21, 2007, as the third single from "Good Girl Gone Bad". A Spanglish version featuring David Bisbal was made available on April 28, 2008. "Hate That I Love You" is a mid-tempo R&B song about the power of love, with influences of folk music. "Hate That I Love You" received generally positive reviews from critics, many of whom compared it to previous works by Ne-Yo.
Document 7: Rated R: Remixed: Rated R: Remixed (stylized as Rated R /// Remixed) is the second remix album by Barbadian singer Rihanna. It was released on May 8, 2010, in Brazil and Europe and on May 24, 2010, in the United States by Def Jam Recordings. It contains remixes from her fourth studio album, "Rated R" (2009). The songs were solely remixed by Chew Fu. The majority of the remixes were remastered to incorporate influences from the genre of house music, and incorporate heavy usage of synthesizers as part of their instrumentation.
Document 8: SOS (Rihanna song): "SOS" is a song by Barbadian singer Rihanna from her second studio album "A Girl like Me" (2006). It was written by Jonathan "J.R." Rotem, E. Kidd Bogart and Ed Cobb, with production was handled by Rotem, Carl Sturken and Evan Rogers. It was released on February 14, 2006, as the lead single from the album. "SOS" is a dance-pop song which samples Soft Cell's 1981 recording of "Tainted Love", a song written by Cobb in 1965. Critical reception of "SOS" was generally positive, with the majority of music critics praising the inclusion of the "Tainted Love" sample. Some critics compared "SOS" to Rihanna's debut single, "Pon de Replay" ("Music of the Sun", 2005).
Document 9: Good Girl Gone Bad: Good Girl Gone Bad is the third studio album by Barbadian singer Rihanna. It was released on May 31, 2007, by Def Jam Recordings and SRP Records. Rihanna worked with various producers on the album, including Christopher "Tricky" Stewart, Terius "Dream" Nash, Neo da Matrix, Timbaland, Carl Sturken, Evan Rogers and StarGate. Inspired by Brandy Norwood's fourth studio album "Afrodisiac" (2004), "Good Girl Gone Bad" is a pop, dance-pop and R&B album with 1980s music influences. Described as a turning point in Rihanna's career, it represents a departure from the Caribbean sound of her previous releases, "Music of the Sun" (2005) and "A Girl like Me" (2006). Apart from the sound, she also endorsed a new image for the release going from an innocent girl to an edgier and more sexual look.
Document 10: Half of Me (Rihanna song): "Half of Me" is a song recorded by Barbadian recording artist Rihanna for her seventh studio album "Unapologetic" (2012). It was written by Emeli Sandé, Naughty Boy and Stargate, with production done by the latter two. It is a chamber pop and R&B song that sees Rihanna deliver vocals in an "experimental" fashion. Its lyrics have been described as a "personal essay", with lyrics that discuss Rihanna's unrepentant attitude in letting people into her life. She references Oprah Winfrey in the line "You saw me on the television". The song garnered positive reviews from music critics, some of whom felt that it is "heartfelt" and "psychedelic". Upon the release of "Unapologetic", the song charted in Canada, France, Ireland, Switzerland and the United Kingdom. It debuted at number 10 on the UK R&B Chart.
Document 11: We Ride: "We Ride" is a song by Barbadian singer Rihanna from her second studio album "A Girl like Me" (2006). It was written by Makeba Riddick, Mikkel S. Eriksen and Tor Erik Hermansen, with production helmed by StarGate. The song was released on August 21, 2006, as the album's third single. "We Ride" is a hip hop and soul song. Critical reception of the song was generally positive, as the majority of reviewers praised its relaxing and carefree qualities.
Document 12: Unfaithful (song): "Unfaithful" is a song by Barbadian singer Rihanna from her second studio album "A Girl like Me" (2006). It was written by Shaffer "Ne-Yo" Smith with the song's producers StarGate. The song was released by Def Jam Recordings on May 2, 2006, as the second single from the album. "Unfaithful" is a pop and R&B ballad and was inspired by the works of American rock band Evanescence. Originally titled "Murderer", the single speaks about a woman who regrets cheating on her partner.
Document 13: Rihanna: Robyn Rihanna Fenty ( ; February 20, 1988) is a Barbadian singer, songwriter, and actress. Born in Saint Michael, Barbados and raised in Bridgetown, during 2003 she recorded demo tapes under the direction of record producer Evan Rogers and signed a recording contract with Def Jam Recordings after auditioning for its then-president, hip hop producer and rapper Jay Z. In 2005, Rihanna rose to fame with the release of her debut studio album "Music of the Sun" and its follow-up "A Girl like Me" (2006), which charted on the top 10 of the US "Billboard" 200 and respectively produced the singles "Pon de Replay" and "SOS".
Document 14: Rude Boy (Rihanna song): "Rude Boy" is a song by Barbadian singer Rihanna, taken from her fourth studio album, "Rated R" (2009). It was released as the album's third single on February 19, 2010, through Def Jam. Rihanna co-wrote the song with StarGate, Ester Dean, Makeba Riddick, and Rob Swire, with Swire also co-producing it with StarGate. "Rude Boy" is an up-tempo dancehall and R&B song which incorporates elements of raggamuffin. The song received mixed to positive reviews from critics; some called it is the highlight of the album, but others criticized Rihanna's "monotone" and "icy" vocal performance.
Document 15: Break It Off: "Break It Off" is a song by Barbadian singer Rihanna from her second studio album "A Girl like Me" (2006), and features guest vocals from Sean Paul. It was written by Donovan Bennett, Paul, K. Ford and Rihanna, while production was handled by Don Corleon. The song was released on November 13, 2006, as the album's fourth and final single. "Break It Off" is a futuristic pop-dancehall song, which is layered over an electro-reggae beat.
ground_truth: Shaffer "Ne-Yo" Smith