Album, and "White Horse" won Best Country Song and Best Female Country Vocal Performance. Swift was the youngest artist to win Album of the Year. At the 2009 Country Music Association Awards, Swift won Album of the Year for Fearless and was named Entertainer of the Year, the youngest person to win the honor. Swift featured on John Mayer's single "Half of My Heart" and Boys Like Girls' single "Two Is Better Than One", both of which she co-wrote. She co-wrote and recorded "Best Days of Your Life" with Kellie Pickler, and co-wrote two songs for the Hannah Montana: The Movie soundtrack—"You'll Always Find Your Way Back Home" and "Crazier". She contributed two songs to the Valentine's Day soundtrack, including the single "Today Was a Fairytale", which was her first number-one on the Canadian Hot 100, and peaked at number two on the Billboard Hot 100. While shooting her film debut Valentine's Day in October 2009, Swift dated co-star Taylor Lautner. In 2009, she made her television debut as a rebellious teenager in an CSI: Crime Scene Investigation episode. She hosted and performed as the musical guest on Saturday Night Live; she was the first host to write their own opening monologue. 2010–2014: Speak Now and Red In August 2010, Swift released "Mine", the lead single from her third studio album, Speak Now. It entered the Hot 100 at number three. Swift wrote the album alone and co-produced every track. Speak Now, released on October 25, 2010, debuted atop the Billboard 200 with first-week sales of one million copies. It became the fastest-selling digital album by a female artist, with 278,000 downloads in a week, earning Swift an entry in the 2010 Guinness World Records. Critics appreciated Swifts grown-up perspectives; Rob Sheffield of Rolling Stone wrote, "in a mere four years, the 20-year-old Nashville firecracker has put her name on three dozen or so of the smartest songs released by anyone in pop, rock or country." The songs "Mine", "Back to December", "Mean", "The Story of Us", "Sparks Fly", and "Ours" were released as singles, with the latter two reaching number one. "Back to December" and "Mean" peaked in the top ten in Canada. She briefly dated actor Jake Gyllenhaal in 2010. At the 54th Annual Grammy Awards in 2012, Swift won Best Country Song and Best Country Solo Performance for "Mean", which she performed during the ceremony. Swift won