By Breaking Celebrity News Staff

Kristin Cavallari's baby shower on Saturday was a mini Hills reunion.

Spencer Pratt, his wife Heidi Montag and sister Stephanie Pratt hosted the event at a private home in West Hollywood.

Cavallari wore a black maxi dress to the party, and later tweeted it to her fans.

But Heidi, in a revealing tight pink top designed to show off her more than ample assets almost stole the show!

Guests enjoyed cupcakes and cocktails -- non-alcoholic for the mom-to-be -- and shared gifts including baby clothes and toys.