When you gotta go, you gotta go!

We caught Ben Affleck using the Porta-Potty outside his $20 million Pacific Palisades mansion yesterday afternoon, and we're guessing that his plumbing must be under construction. Why else would he choose to use a stinky outhouse?

While he was taking care of his business, girlfriend Lindsay Shookus was getting some exercise in the neighborhood. Pregnancy rumors have been plaguing the couple for months, and we can't say either way whether we think they've got a bun in the oven. She could have just had a big lunch, or these are unflattering leggings, but we wouldn't be the least bit surprised if the next time we see her, she has a noticeable bump!

One thing we won't be seeing? The A-list star's lady love hanging with his brood!

"Jen doesn’t want the kids around Lindsay or having her in their lives. She has many reasons,” a source dished to Us Weekly, adding "the fact that Ben had an affair with her" is a main sticking point.

"Ben understands and has honored her request. They’re good friends. She wants him to be honest and he usually is. She tends to find out about things, and Ben is very open with her. They both want what’s best for the kids and have made a commitment to see that through," the source added.

It must be true love!