Chace Crawford: Take two!

The Gossip Girl star proved that remembering lines can be tricky in a new public service announcement for the charity, Teens for Jeans. The PSA (watch above) includes a 2-minute blooper reel of the star.

“I hope I have it memorized the third time around!” Crawford joked.

Check out other stars doing good deeds.

In the campaign, the actor encourages others to…