By InStyle Staff
Updated Feb 13, 2012 @ 4:30 pm
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Credit: Courtesy Beyonce.com; IMAXTREE

We caught up with Monique Lhuillier at her fall 2012 fashion show, where the designer gave us the inside scoop on the black sequined cocktail dress Beyoncé wore to Jay-Z's Carnegie Hall performance last week. “It was her second appearance since she had her baby, and she looked amazing!" Lhuillier told InStyle.com. "She surprised me by wearing it! But she's such a pro, she put it on and looked fabulous." We agree! What do you think of Bey's post-baby style? Let us know in the comments!

See Monique Lhuillier's latest collection!

— Grace Lee