Leighton Meester by Jamie McCarthy/WireImage.com Leighton Meester by Jamie McCarthy/WireImage.com

OMG, it's almost too good to be true: The Queen B thesp of Gossip Girl is set to appear in an eppy of Entourage, returning as pop singer Justine Chapin, a role she played in Season 1.

In a castgasm that bridges the hot brat packs of the East and the West, Leighton Meester (aka Blair Waldorf on CW's Gossip) will reprise her previous role, says E!. Meester's Chapin had a long-ago crush on Vince, which may heat things up this time around for the boys in L.A.

Are you as ready as I am to see Meester return - or maybe just to hear the word " Entourage" in relation to next season? How do you think things things will play out for Justine? - Anna Dimond

Use our Online Video Guide to enjoy both Gossip Girl and Entourage.