No. 1: Taylor Swift 
Birthdate: December 13, 1989 (age 20)
Why She's Hot: Ms. Swift may have been dissed by Kanye  while the world was watching, but she handled "Taylorgate" with the class of a woman rather than a teenager. Perhaps it's because, at the ripe old age of 20, Swift is already a veteran in the music game. At age 14, she became the youngest staff songwriter in the history of Sony/ATV Music Publishing, and two years later, she landed on the charts with her first hit single, "Tim McGraw." Since then, Taylor's rise has indeed been swift; her sophomore LP "Fearless" ruled as 2009's top-selling album, and was awarded that year's Album of the Year Grammy. Now, the CMA Entertainer of the Year is set to do it all again - "Mine," the first single from her new album "Speak Now," is a Hot 100 smash and "Innocent," the song she penned about her run-in with Kanye, is already a viral sensation, thanks to its buzzed-about debut on this year's VMAs . Lots of young stars will be making waves over the next year, but Taylor is geared up to hit the music world like a tsunami. Brace for the impact.
Video Below: Taylor's "Mine"
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