Fresh off of his dressed up, grown up GQ cover debut, Justin Bieber hit up the Yves Saint Laurent fashion show in L.A. last night. JB documented his evening on various social media platforms, snapping selfies with Joan Jett and making sure the world knows "what a cute kid" Beck has.

The face he made while watching the show, though, didn't exactly express what a fun-filled evening he had enjoyed.

Justin poked fun at his face on Twitter — I'd like to poke it with my finger, but that's a different story ? — letting us know that, yeah, he had a good time. He's just very serious about fashion, OK?