True story! -
I'm working on a movie shoot with Missi Pyle (Scarlett Beauregarde), and there's a scene at a christmas dinner and the script called for her to sit back and say "Oh, man that was good. I should have brought my sweatpants!". Well, first of all, the caterer served us mexican food for lunch, and she had told us while we were shooting that scene that she was really bloated and gassy from it and was joking about her doing it on purpose because she's a method actress. Then when we were filming it, she was getting really into it, leaning back and pushing her stomach way out, moaning and rubbing her belly, and she even tugged her shirt up so that a little bit of her midriff was showing. Needless to say, I had the strangest boner. That said, I wasn't close enough to the set or any monitors at the time to know if they actually filmed her belly, or if it looks hot on film, I was only around when they were rehearsing. Also, I wouldn't get your hopes up, since they could show her in detail and play it for laughs, but it's ultimately one line in one scene, and I doubt it.
Only tengentially related to OP, but just thought it might be relevant to somebody's interest.