Transitioning from gospel music to secular music, Perry started writing songs with producer Glen Ballard, and moved to Los Angeles at age 17. In 2003, she briefly performed as Katheryn Perry to avoid confusion with actress Kate Hudson. She later adopted the stage name Katy Perry, using her mother's maiden name. Ballard then introduced Perry to Tim Devine, an A&R executive at Columbia Records, and she was signed as a solo artist. Over the course of the next two years, Perry wrote and recorded material for her Columbia debut, and worked with mant established songwriters. Perry had minor success prior to her breakthrough. One of the songs she had recorded for her album with Ballard, "Simple", was featured on the soundtrack to the 2005 film The Sisterhood of the Traveling Pants. She provided backing vocals on Mick Jagger's song "Old Habits Die Hard", which won the 2005 Golden Globe Award for Best Original Song, and, in September 2004, Blender named Perry "The Next Big Thing". Perry released her first single with Capitol, "I Kissed a Girl", on April 28, 2008, as the lead single from One of the Boys. The track reached number one on the U.S. Billboard Hot 100. "Hot n Cold" was released in September and became the album's second successful single, reaching number three on the Billboard Hot 100, while topping charts in Germany, Canada, the Netherlands, and Austria. After finishing the Warped Tour 2008, Perry hosted the 2008 MTV Europe Music Awards in November 2008, where she won the award for Best New Act. After serving as a guest judge on American Idol, Perry released "California Gurls" featuring rapper Snoop Dogg on May 7, 2010. The song was the lead single from her third studio album, Teenage Dream, and reached number one on the Billboard Hot 100 in June. She also served as a guest judge on The X Factor UK later that month before releasing the album's second single, "Teenage Dream", in July. Perry embarked on her second tour, the California Dreams Tour, in support of Teenage Dream from February 2011 to January 2012. The tour grossed over $59 million globally and won her the award for Best Live Act at the 2011 MTV Europe Music Awards. On social media, Perry surpassed Justin Bieber as the most followed person on Twitter in November 2013. She won the 2015 Guinness World Record for most Twitter followers, and became the first person to gain 80 million followers on the site in January 2016. Perry has received many awards, including four Guinness World Records, and been included in the Forbes list of "Top-Earning Women In Music" (2011–15). Throughout her career, she has sold 11 million albums and 81 million singles worldwide.Katy Perry is an American singer, songwriter, and actress who rose to fame in 2008 with the release of the singles "I Kissed a Girl" and "Hot n Cold".