Hey M girls!

Today's Say What?! picture is a photo of Penn Badgley and Blake Lively filming a '80s Gossip Girl scene!

Now, write a funny caption for the photo or tell us what Penn and Blake are thinking!

Make sure to check back here Tuesday to see if your comment won for the funniest!

Update! And the winning comment goes to I <3 nick jonas who wrote:
Blake: (laughs) Nice hat!
Penn: Thanks I like your clips, just remember to return them to my grandma when your done!

And you have to pick up the September issue of M for the latest star scoop!

Photo: Humberto Carreno/Startraks