Supermodels don't eat just any pizza! If they're gonna indulge, it's gotta be a good one! So Hailey Baldwin hit up Jon & VInny's in Brentwood for some wood-fired truffle pizza with a friend, on Sunday afternoon ... and of course she did it in perfectly on-point style.

Mrs. Bieber wore an oversized blazer (she's really been working this trend recently), an Alexander Wang tee, Nike SB Gatos, jeans, and a white Jacquemus bag. She didn't look TOO happy to see our photographers there -- perhaps the attention is wearing on her, like it is for her husband ...