Question: What artist born in 1989, co-wrote the song "Best Days of Your Life" which was performed by Kellie Pickler?

full_context: Document 1: Taylor Swift discography: American singer-songwriter Taylor Swift's career began with a record deal with Big Machine Records in 2005 and the release of her eponymous debut album the following year. In the United States, "Taylor Swift" peaked at number five on the "Billboard" 200 and stayed the longest on the chart during the 2000s. All of its singles—"Tim McGraw", "Teardrops on My Guitar", "Our Song", "Picture to Burn", and "Should've Said No"—charted within the top forty in the United States and were certified platinum by the RIAA. Swift followed with the release of the EPs "" and "Beautiful Eyes", which peaked at number twenty and number nine on the "Billboard" 200, respectively.
Document 2: Don't You Know You're Beautiful: "Don't You Know You're Beautiful" is a song written by Chris Lindsey, Aimee Mayo, and Karyn Rochelle (who co-wrote her previous hits "Red High Heels" and "I Wonder"), and recorded by American country artist Kellie Pickler. It served as the lead-off single to her self-titled second album. Pickler debuted the song at the 43rd annual Academy of Country Music Awards, and it was officially released to radio in June as the fourth single of her career.
Document 3: Kellie Pickler (album): Kellie Pickler is the self-titled second studio album by American country artist Kellie Pickler. The lead-off single, "Don't You Know You're Beautiful", was debuted at the 43rd Academy Of Country Music awards and peaked at 21 on Hot Country Songs. The album was released via BNA Records/19 Recordings on September 30, 2008. Since the albums' release, three more singles have charted; "Best Days of Your Life" at number 9 (which was co-wrote with fellow country artist Taylor Swift), "Didn't You Know How Much I Loved You" at number 14 (a re-recording of an album cut from Pickler's debut album "Small Town Girl") and "Makin' Me Fall in Love Again" at number 30.
Document 4: You Belong with Me: "You Belong with Me" is a song performed by American singer-songwriter Taylor Swift. The song was co-written by Swift and Liz Rose and produced by Nathan Chapman with Swift's aid. It was released on April 18, 2009, by Big Machine Records as the third single from Swift's second studio album, "Fearless" (2008). Swift was inspired to write "You Belong with Me" after overhearing a male friend of hers arguing with his girlfriend through a phone call; she continued to develop a story line afterward. The song contains many pop music elements and its lyrics have Swift desiring an out-of-reach love interest.
Document 5: Back to December: "Back to December" is a song written and recorded by American singer/songwriter Taylor Swift for her third studio album "Speak Now" (2010). The song was sent to country radio in the United States on November 15, 2010, as the second single from "Speak Now". According to Swift, "Back to December" is the first time she ever apologizes to someone in a song. Critics speculate that the song is about Taylor Lautner, Swift's ex-boyfriend, which was later acknowledged by Lautner. "Back to December" is considered an orchestral country pop ballad and its lyrics are a remorseful plea for forgiveness for breaking up with a former lover.
Document 6: Taylor Swift (album): Taylor Swift is the debut studio album by American singer-songwriter Taylor Swift, released on October 24, 2006, by Big Machine Records. Swift was 16 years old at the time of the album's release and wrote its songs during her freshman year of high school. Swift has writing credits on all of the album's songs, including those co-written with Liz Rose. Swift experimented with several producers, ultimately choosing Nathan Chapman, who had produced her demo album. Musically, the album is country music styled, and lyrically it speaks of romantic relationships, a couple of which Swift wrote from observing relationships before being in one. Lyrics also touch on Swift's personal struggles in high school.
Document 7: Liz Rose: Liz Rose (born in Dallas, Texas) is an American country music songwriter best known for her work with Taylor Swift. She has co-written twenty of Swift's officially-released songs and singles, including "White Horse," "Teardrops on My Guitar," and "You Belong with Me," which won her and Swift a Grammy Award in 2010.
Document 8: Didn't You Know How Much I Loved You: "Didn't You Know How Much I Loved You" is a song written by Chris Lindsey, Aimee Mayo, and Troy Verges, and recorded by American country artist Kellie Pickler. It was released in August 2009 as the third single from her self-titled second album, and her sixth single release overall. The song is a ballad where a narrator describes her lost love, responding to him with said song title as a question.
Document 9: 1989 (Taylor Swift album): 1989 is the fifth studio album by American singer-songwriter Taylor Swift released on October 27, 2014, through Big Machine Records. Swift began composing the album following release of previous studio effort, "Red" (2012). Over the course of the two-year songwriting period, she collaborated with producers Max Martin and Shellback—Martin served as the album's executive producer alongside Swift. The album's title was named after the singer's birth year and inspired by the pop music of the 1980s.
Document 10: Taylor Swift videography: American singer-songwriter Taylor Swift has released four video albums and has appeared in thirty-eight music videos, five films and three television shows. From her eponymous debut album (2006), she released music videos for the singles "Tim McGraw", "Teardrops on My Guitar", "Our Song", and "Picture to Burn", all directed by Trey Fanjoy and released from 2006–08. For the second of these, she earned an MTV Video Music Award for Best New Artist nomination. She followed with three other music videos in 2008—"Beautiful Eyes" from her extended play of the same name, "Change" from the "AT&T Team USA Soundtrack" and "Love Story" from her second album "Fearless" (2008). The latter was nominated for two awards at the 2009 CMT Music Awards—Video of the Year and Female Video of the Year. For the video of "You Belong with Me" she won Best Female Video at the 2009 MTV Video Music Awards. During her acceptance speech, she was interrupted by rapper Kanye West, which sparked controversy and received much media attention.
Document 11: Taylor Swift: Taylor Alison Swift (born December 13, 1989) is an American singer-songwriter. One of the leading contemporary recording artists, she is known for narrative songs about her personal life, which have received widespread media coverage.
Document 12: Speak Now: Speak Now is the third studio album by American singer-songwriter Taylor Swift. It was released on October 25, 2010, by Big Machine Records. Production for the album took place during 2009 to 2010 at several recording studios, and was handled by Swift and Nathan Chapman. Written entirely by Swift as the follow-up to "Fearless", "Speak Now" expands on the country pop style of her previous work, and features lyrical themes including love, romance and heartbreak.
Document 13: Best Days of Your Life: "Best Days of Your Life" is a song written and performed by American country artist Kellie Pickler, and co-written by Taylor Swift. It was released on December 1, 2008 as the second single from her self-titled second album. Swift also provides background vocals on the song. The song is about a narrator explaining how her former boyfriend cheated on her and moved on to a new girlfriend to start a family with, wishing them well on their new life but says that the new girl won't top what they previously once had before.
Document 14: Our Song (Taylor Swift song): "Our Song" is a country song performed by American singer-songwriter Taylor Swift. The song was written by Swift and produced by Nathan Chapman. It was released on September 9, 2007 by Big Machine Records as the third single from Swift's eponymous debut album, "Taylor Swift" (2006). Swift solely composed "Our Song" for the talent show of her freshman year in high school, about a boyfriend who she did not have a song with. It was included on "Taylor Swift" as she recalled its popularity with her classmates. The uptempo track is musically driven mainly by banjo and lyrically describes a young couple who use the events in their lives in place of a regular song.
Document 15: List of songs recorded by Taylor Swift: Taylor Swift is an American singer-songwriter. She signed a record deal with Big Machine Records in 2005 and released her eponymous debut album in 2006. Swift wrote three of the album's tracks: "Our Song", "Should've Said No", and "The Outside". The remaining eight were co-written with writers Liz Rose, Robert Ellis Orrall, Brian Maher, and Angelo Petraglia. In 2007, she released her first extended play (EP) "", which contains two original tracks written by her: "Christmases When You Were Mine" and "Christmas Must Be Something More".
ground_truth: Taylor Swift.