By peoplestaff225
Updated February 12, 2010 03:00 PM

Wearing a red Isabella Oliver Ruched One-Shoulder dress ($179) at the Heart Truth Red Dress Collection Show on Thursday, Bethenny Frankel proved she’s one sexy mom-to-be.

The Real Housewives of New York star’s body-hugging frock — made of a soft viscose/spandex blend — showed off all her curves, while the built-in shelf bra gave her a nice lift.

Bethenny wasn’t the only hot celeb on the runway.

The newly engaged reality star — who’s due in June — was joined by Kim Kardashian, Heidi Klum and Elisabeth Hasselbeck at the annual charity event, part of New York Fashion Week.