Dianna Agron stops to say hi to some fans as she arrives at the Ed Sullivan Theater in New York City on Monday afternoon (August 1).

The 25-year-old actress, wearing a lovely Stella McCartney LBD, appeared on The Late Show with David Letterman to chat about the upcoming Glee 3D Concert Movie, 3D glasses and her broken noses!

“My freshman year in high school, I accidentally turned into an argument and instead of the girl punching the guy, she wound up to the side and punched me. That was broken nose number one,” Dianna shared. “Blood everywhere and of course, this ended up on camera.”

Check out the video below for more of Dianna‘s broken nose tales. 15+ pics inside…