The 100th episode of "Gossip Girl" airs Monday, Jan. 30, and will open with a musical dream sequence featuring Serena (Blake Lively), Blair (Leighton Meester) and all the men in their lives (Penn Badgley, Chace Crawford, Ed Westwick and Hugo Becker). Leighton plays Audrey Hepburn while Blake channels Marilyn Monroe.

Do you think Blake makes a believable Marilyn? She wears a strapless pink dress, gloves and many jewels, mimicking "Diamonds Are a Girl's Best Friend" from "Gentlemen Prefer Blondes." Check out more photos on the following pages.

The episode will also focus on Chuck (Westwick) wrestling with the reality that Blair is about to walk down the aisle with Prince Louis (Becker) and the return of Georgina Sparks (Michelle Trachtenberg), who might make the royal affair a royal disaster.