Heidi Montag and Spencer Pratt recently shared that they are expecting their first child
, and Cavallari -- who was wearing a Rebecca Vallance Harris skirt -- told ET's Nischelle Turner that she's been chatting with the mom-to-be "all the time" about motherhood. "Heidi has been asking me lots of baby questions," she shared while at the launch of her jewelry line, Uncommon James
, at Fig & Olive in Hollywood, California, on Thursday. "I'm so excited for her. I know she's been wanting a baby for a while."