See Mark Ruffalo Totally Geek Out Over Paul Rudd

— -- Call off the search—we’ve found Paul Rudd’s biggest fan.

It was a close call, but turns out fellow celeb Mark Ruffalo takes the cake.

The Incredible Hulk himself totally geeked out when he saw Rudd, 45, being interviewed by HitFit at Comic-Con this weekend.

Rudd was talking about his new film, "Ant-Man," when Ruffalo, 46, walked by in the background and could barely contain his excitement.

“Is that Paul Rudd?,” Ruffalo mouthed in the background, pointing at Rudd. “Is that Paul Rudd?,” he continued, clearly very starstruck.