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Blake Lively channels Marilyn Monroe on "Gossip Girl"

From left, Chace Crawford, Hugo Becker, Blake Lively and Ed Westwick on "Gossip Girl." The CW Network

(CBS) "Gossip Girl" is moving from the Upper East Side to Hollywood - temporarily - for the show's 100th episode.

In the milestone episode, Serena van der Woodsen (Blake Lively) imagines herself as Marilyn Monroe in a dream sequence. (Scroll down to see more photos from the scene.)

Pictures: Blake Lively

Serena dons a pink dress and lots of jewelry a la "Diamonds are a Girl's Best Friend" from "Gentlemen Prefer Blondes," surrounded by suitors including Nate Archibald (Chace Crawford), Chuck Bass (Ed Westwick) and Dan Humphrey (Penn Badgley).

Blair Waldorf (Blake Lively) also makes an appearance in the fantasy, as Audrey Hepburn.

"Gossip Girl" executive producer Josh Safran told Yahoo! TV that he's wanted to film the Monroe number since the show began.

"It's something we've never done before. From Season 1, I said, 'I want to do this.' But it just wasn't the right time. I've been pushing it for five years, and it finally happened," he said.

"G.G." - Pictured (L to R in a dream sequence) Hugo Becker as Louis, Penn Badgley as Dan Humphrey, Ed Westwick as Chuck Bass, Chace Crawford as Nate Archibald, Leighton Meester as Blair Waldorf and Blake Lively as Serena Van Der Woodsen in GOSSIP GIRL on The CW. Photo: Giovanni Rufino/©2011 The CW Network, LLC. All Rights Reserved The CW Network
"G.G." - Pictured (L to R in a dream sequence) Chace Crawford as Nate Archibald, Ed Westwick as Chuck Bass, Blake Lively as Serena Van Der Woodsen and Penn Badgley as Dan Humphrey in GOSSIP GIRL on The CW. Photo: Giovanni Rufino/©2011 The CW Network, LLC. All Rights Reserved The CW Network
"G.G." - Pictured (semi circle L to R in a dream sequence) Ed Westwick as Chuck Bass, Chace Crawford as Nate Archibald, Blake Lively as Serena Van Der Woodsen, Hugo Becker as Louis and Penn Badgley as Dan Humphrey in GOSSIP GIRL on The CW. Photo: Giovanni Rufino/©2011 The CW Network, LLC. All Rights Reserved The CW Network