A former Christian artist, Katy Perry combines the cheeky, club-ready pop music of Lily Allen with the commercial pop/rock of Avril Lavigne and Alanis Morissette. Her debut single, "UR So Gay," generated some online buzz with its mischievous lyrics and accompanying music video. However, "I Kissed a Girl" proved to be her true breakthrough single, topping the charts in 20 countries and pushing its accompanying album, 2008's One of the Boys, into the Top Ten in America. Meanwhile, "Hot N Cold" became her second number one hit and "Waking Up in Vegas" cracked the Top Ten. Recording sessions for her next album wrapped up in early 2010, and Perry scored her second number one single with “California Gurls,” which was released that May. The accompanying album, Teenage Dream, followed in August and later produced the number-one singles "Firework", "E.T.", and "Last Friday Night (T.G.I.F.)". Teenage Dream became the first album recorded by a female artist in history to produce five number-one hits. Her fourth album, Prism (2013), was preceded by the number-one single "Roar". The album later produced the number-one single "Dark Horse". Perry has received numerous awards and nominations, including eleven Grammy nominations and Billboard dubbed her as 2012's Woman of the Year. She remains the only artist to spend 69 consecutive weeks in the top ten of the Hot 100. As of November 2013, Perry has sold more than 11 million albums and 81 million singles worldwide and her singles are some of the best-selling worldwide.