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Someone's on the breakup diet ... and she looks hungry too!

Selma Blair was snapped grabbing coffee after a trip to the gym yesterday, and the 40-year-old actress has always been on the slim side, but she definitely hasn't put on a single pound since splitting with baby daddy Jason Bleick. In fact, it looks like she's dropped a few since the news broke earlier this month!

Noticeably absent was her adorable son Arthur, and there's still no word on the identity of the mystery man she was photographed with the other day ...