Well, it is just one big party, so it's nothing shocking, but it is quite surprising to see the normally reserved Phillippe behaving like this in public!

Our French correspondents spotted the brooding actor screaming and stumbling on the Croissette, where he had to be held up by his friends and his girlfriend, Abbie Cornish.

At one point, when Ryan tries to sneak underneath a barricade, he even fell over!

Ya'd think at this point he would just want to call it a night, but the group wasn't heading to their hotel, they hit up Nikki Club for some more festivities instead!

I hope he's spending the day sleeping it off...