Kim, Kris And Brody Party Together In NYC For Avril's Record Release Party

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Avril Lavigne loves her boyfriend Brody Jenner, and apparently his half-sister Kim Kardashian, too!

Kim and beau Kris Humphries joined Avril and Brody at New York hotspot SL to celebrate the release of the pop sensation's newest album Goodbye Lullaby.

The "So Complicated" singer even serenaded her sexy man, and by the look in his eyes, he's loving it. Such a cute black tutu, Avril.

A green and white cake was presented to the punk princess in honor of her big day, and we're told Ciroc specialty cocktails were flowing.

What a sexy foursome!

See Avril and Kim working the green carpet ... after the jump.