Shocking Guest Stars, from Rachel Zoe to Robyn, on Tonight’s ‘Gossip Girl’

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Gossip Girl continues, against all odds, to make Mondays our favorite day of the week. Tonight’s episode, “War of the Roses,” is worthy of canceling your evening plans and spending a few quality hours (one hour to watch the episode, another hour to rewatch the best parts) in front of your TV.

Rock star Robyn, superstar stylist Rachel Zoe, Elle It boy Joe Zee, and red carpet design royalty Cynthia Rowley are all making cameos.

Here’s the scoop on tonight’s ep, straight from CW.

Without giving any spoilers away, “Blair is caught off-guard – and not in a good way – by a surprise guest at her birthday party. Having had enough of Chuck and Blair’s games, Serena and Nate decide to plan an intervention.”