Here's the funny thing: Mark Ruffalo is very famous. (Don't act like you can't recite 13 Going on 30 by heart.) But he's still super-proud to be surrounded by his fellow celebrities and friends, which is why he started snapping photos of them mid-panel.
And, honestly, he's still basking in the afterglow of that moment. Just today, he tweeted this amazing series of tweets:
"Say Cheese, Cate!"
"Oh man. I, Mark Ruffalo, am #blessed."
The cuteness of it all is just way too much for me to handle. Never change, Mark Ruffalo. Never change.