David Letterman must have finally learned what a selfie was because he couldn’t stop taking selfies with Emma Stone. Although, who could blame him?

Stone, who has a lot to promote this winter, appeared on The Late Show last night. After posing for one selfie, they couldn’t resist to take another one. They used their second one to diagnose health issues.

“Oh, this is fascinating. Speaking of medical activities... normal,” he said, pointing to Stone’s face. “High blood pressure. Really, really high blood pressure,” Letterman said as he pointed to his face.

“No, this is reduced inflammation,” Stone butted in. “I have no blood in my face!”

Stone, 26, also surprisingly admitted that she only recently figured out what the word “selfie” means. That’s hard to believe, but considering how busy she has been, it’s entirely possible.

Stone is currently on Broadway in Cabaret and can be seen on the big screen in Birdman with Michael Keaton. She was also in The Amazing Spider-Man 2 and Magic in the Moonlight this year and filmed another Woody Allen movie that should be out in 2015.

image courtesy of Dara Kushner/INFphoto.com