Kim Kardashian went on a double date with her stepbrother last night -- for Avril Lavigne's album launch party!

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Kim and boyfriend Kris Humphries kicked it with Avril and Brody Jenner at SL Lounge in NYC on Tuesday, where the group celebrated Lavigne's new album "Goodbye Lullaby" with a cake and some dancing.

The album dropped last week. Check out all the party pics!



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