While she was doing crunches, he was getting a cleaning.

We caught Shauna Sexton heading to the gym today in LA, right around the time we also caught Ben Affleck dropping by the dentist for an appointment. We're surprised they didn't "accidentally" cross paths for a bit to squeeze in a little quality time before he headed back to rehab.

The Playboy model is making the most of her time in the spotlight, so she hopped on Instagram yesterday to share a pic of herself in a thong from a recent photoshoot with her followers. Now we see why the Oscar winner is so interested!

The pinup might want to enjoy the romance while it lasts, because insiders are telling us her days are numbered.

A source tells X17:
    "Counselors are playing nice with Ben because he's still in the early stages of his recovery, so they're not trying to slap him with a million rules, but once he moves into more long term care, his therapists and sponsors are going to put their foot down over him dating Shauna. It's a well known fact in the recovery community that it's a good idea to stay single for your first year of sobriety, and he hasn't been dating Shauna long enough to justify otherwise. It's not like she's the love of his life."

We're dying to know what Lindsay Shookus thinks of all this!

🍉 @breesbeautiesxo working some iPhone magic 📸

A post shared by Shauna Sexton (@shaunasexton_) on