Kim Kardashian stole the show from Avril Lavigne!

Kardashian and NBA beau Kris Humphries accompanied Lavigne and Brody Jenner to the singer's "Goodbye Lullaby" release party in NYC Tuesday night. The foursome sipped on Ciroc cocktails at SL Lounge  to celebrate Lavigne's fourth studio album.

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"I was just listening to the CD with Avril in the car. It's so great. I love it," Kardashian said of her step-brother's new lady.  

A witness tells that the 30-year-old reality star was "super affectionate" with Humphries, 25, all night. She was perched on the lap of her basketball star beau, and the two weren't shy about packing on the PDA.

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Even though the couple has only been together a few months, Kardashian confessed to Extra that she has babies on the brain and hasn't found "one thing wrong" with her new man!

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Jenner dodged interviews, but he told reporters he was "proud" of Lavigne. The 26-year-old also gave a shout-out to her "boyfriend Brody" and thanked him for "putting up with her."

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