When the science fiction loving cast of 'The Big Bang Theory' met Mark Hamill, who plays Luke Skywalker from 'Star Wars,' they were obviously star struck.

Mayim Bialik, who plays Amy Farrah Fowler on the show, took to Twitter to share a sneaky selfie with costar Kaley Cuoco, who plays Penny. The selfie shows the two freaking out while Hamill stands in the background. Bialik wrote, "Literally what happened when Kaley and I met @HamillHimself !!! Also I peed my pants."

Literally what happened when Kaley and I met @HamillHimself !!! Also I peed my pants. pic.twitter.com/kQQtiYLl9Z

— Mayim Bialik (@missmayim) April 18, 2018

Bialik followed up her selfie with a video of her gushing about meeting Hamill and shaking his hand. The actor wrote, "I can't handle it!!! I met @HamillHimself and recorded this because I was so overwhelmed. Everything is great!!"

I can't handle it!!! I met @HamillHimself and recorded this because I was so overwhelmed. ???????????? Everything is great!! pic.twitter.com/FetJ1PjBLu

— Mayim Bialik (@missmayim) April 18, 2018

Who knew Bialik—an award-winning actor, real-life neuroscientist, and author—was such a fan girl?