gossip girl marilyn 3 cw 'Gossip Girl' sneak peak: The cast celebrates old HollywoodIt looks like the 100th episode of “Gossip Girl” will do more than celebrate the glamor of a high-society wedding (assuming Blair and Louis get hitched). The show will also honor old-Hollywood style during a dance number where Blake Lively channels her inner Marilyn Monroe.

As Zap2it first reported on Dec. 9, Lively re-enacts the famed “Diamonds are a Girl’s Best Friend” scene from the 1953 film “Gentlemen Prefer Blondes.” The routine will include all the regulars and, in a weird ending, feature Leighton Meester dressed as Audrey Hepburn circa “Breakfast at Tiffany’s.”

The curious part about the number, outside of Meester’s appearance, is at the end she drags Dan (Penn Badgley) away rather than her future husband Louis (Hugo Becker). Given Serena’s recent rekindled interest in Dan, it almost plays out like the two are battling for his affection.

The “Gossip Girl” wedding airs Jan. 30 at 8 p.m. ET. Of course before that, there’s Blair’s bachelorette party episode on Jan. 23.

Here are some photos…

gossip girl marilyn 2 cw 'Gossip Girl' sneak peak: The cast celebrates old Hollywood

gossip girl marilyn cw 'Gossip Girl' sneak peak: The cast celebrates old Hollywood

gossip girl marilyn 4 cw 'Gossip Girl' sneak peak: The cast celebrates old Hollywood