Since when did Ben Affleck get so...beefy?

While estranged wife Jennifer Garner has been busting her butt at the gym and looks fitter than ever, Ben seems to have gone the opposite route and put on a few pounds. On Wednesday the actor was spotted working out with a pal in Brentwood, and we got a peek at his moobs under a Harvard tee. Yikes! All that muscle he gained to play Batman seems to have turned to mush.

Ben and Jen haven't finalized their divorce, and last weekend they were spotted out with their three children, Samuel, Seraphina and Violet. What's Jen waiting for? Ben's moobs to melt away? Ben to promise that he won't bang their next nanny? Stay tuned...