Leighton Meester and Blake Lively ditch New York's Upper East Side for a downtown party. Plus: Ashlee Simpson, Will Smith and more

X0X0!

Now that the writers' strike is over, Gossip Girl stars Leighton Meester and Blake Lively will be heading back to work next month – but for now, there's still time to share a laugh at the Reebok Freestyle World Tour event Thursday at 632 on Hudson.