Matt Damon LAX srm sling pink backpack

From carrying one of his daughter's hot pink backpacks to walking through Los Angeles International Airport with a sling on his arm and a smile on his face, Matt Damon is such a good sport!

On Saturday night the actor jetted in to LAX, and he revealed that he broke his collarbone. Damon was first seen with the sling two weeks ago, but last week he went without it, so we didn't realize how serious the injury was. So what happened?

When asked about the sling, a cheerful Damon replied, "I was trying to mountain-bike."