Christmas wasn't the only thing worth celebrating over the long weekend. Sunday (December 27) marked the 21st birthday of Paramore frontwoman Hayley Williams, and she celebrated with a party that included Taylor Swift and a zombie-centric cake that said "21 Years Later." According to Williams' Twitter, the surprise party went down at a roller rink and was organized by boyfriend and New Found Glory guitarist Chad Gilbert.

"Just leaving Hayley Williams' surprise b-day party," Swift wrote on her Twitter. "Roller skates were worn, Hanson was played. Party! Go Hayley!" Williams also noted Swift's dancing and roller skating skills on her Twitter. "Taylor Swift knows how to party!" she wrote. "Don't think I don't have the 'Confessions Pt. 2' dance burned into my mind for life!"

21 will no doubt hold even more greatness for Williams, as 20 was a pretty excellent year. Her band toured with No Doubt, recorded a well-received episode of "MTV Unplugged," won a pair of Teen Choice Awards, got nominated for a Grammy and dropped Brand New Eyes, one of the best albums of the year. For Williams, 2010 will bring tours of Japan and Australia, a headlining spot at the Bamboozle and more singles, videos and awards for Brand New Eyes. In honor of her belated birthday, check out the excellent video for "Brick by Boring Brick," the latest single from Brand New Eyes and the band's most forward-thinking and visually stunning video yet.

show|null|video|454896