The CW has just released a new series of photos from the much-touted 100th episode event, featuring Blake Lively as Serena - or should we say Marilyn Monroe - with Nate, Chuck and Louis as her backup dancers.

The setting for this unexpected scene, as first reported after a set video somehow leaked earlier this season, is Blair's foyer. The chorus line alone would be noteworthy, but that's not all: Queen B shows up too!

With Serena portraying Marilyn and singing "Diamonds Are a Girl's Best Friend," Blair appears as Audrey Hepburn a la "Breakfast at Tiffany's" and the two supposedly start a tug of war over ... Dan.

Check out the earlier 100th episode photos we posted from the January 30 event, "G.G.", then click to enlarge the new set below and see if you think Blake makes a convincing '50s / '60s bombshell:

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.