Happy Birthday Katy Perry!

Katy Perry is having such a huge year that she hardly needs more reasons to celebrate, but she woke up to another one this morning – she turns 27 today.

Happy birthday, Katy!

In 2011 alone, the pop star tied Michael Jackson's record for the most No. 1 hits from a single album, won the MTV Video Music Award for Video of the Year for "Firework," scored four Grammy nominations and has been touring the globe on her sold-out "California Dreams Tour." (We saw her at the Nassau Coliseum on Long Island this summer and thought the show was great!)

In her honor, we've rounded up some of our favorite Katy videos after the jump. Enjoy! (And don't forget to send her some birthday love on Twitter @katyperry!)

"Firework"

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"E.T."

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"Teenage Dream"

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"I Kissed A Girl"

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