Question: Anthony Mandler is an American film director, music video director, television commercial director and photographer, a frequent collaborator of Rihanna, the two have worked on sixteen music videos together throughout her career, beginning with "Unfaithful", a 2006 song by Barbadian singer Rihanna from her second studio album "A Girl like Me", released in what year?

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 "". <SEP> Anthony Mandler (born April 18, 1973) is an American film director, music video director, television commercial director and photographer.  As a music video director, his most notable and frequent collaborator is Rihanna.  The two have worked on sixteen music videos together throughout her career, beginning with "Unfaithful" in 2006 and most recently "Diamonds" in 2012.  He has also written and directed music videos for many other prominent artists including the Spice Girls, Jay Z, Beyoncé, Eminem, Usher, Shakira, Taylor Swift, The Killers, Selena Gomez, Justin Bieber, 50 Cent, Ne-Yo, Nicki Minaj, Drake, Snoop Dogg, Lenny Kravitz, Cheryl Cole, M.I.A., Mary J. Blige, fun.  and Lana Del Rey. <SEP>  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 song by Barbadian singer Rihanna from her second studio album "A Girl like Me" (2006).  "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. <SEP> Luti (Oladoke Lutiseku Mobolaji) Fagbenle is a BAFTA-nominated film producer and entrepreneur.  He is best known for producing music videos for high-profile recording artists such as One Direction, Iggy Azalea, Nicki Minaj, Kanye West, Snoop Dogg and Rita Ora and commercials and branded content for Microsoft, Nike Inc., Beats By Dre, Sony Vaio, Ferrari and Reebok.  He is also well known for his performances as Ali Taylor in popular soap opera "Hollyoaks".  Luti is a frequent collaborator with high-profile international directors such as Colin Tilley, Director X, Anthony Mandler, Kanye West, Ray Kay, Marc Klasfeld and others.