Hailey Baldwin sure knows how to put on a show! The sexy supermodel showed off her amazing abs after a hot Pilates session, on Wednesday.

While hubby Justin Bieber was being pulled over by the cops, Hails was working up a sweat, keeping her model body in shape. And check out that rock! She even wears her engagement ring to work out ... AND a "Bieber" cap! She's not exactly keeping her identity on the DL! She even has a diamond "J" earring!