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She’s ba-aack! Although Blair (Leighton Meester) made it perfectly clear that Little J was no longer welcome in Manhattan after what happened with Chuck (Ed Westwick), Jenny (Taylor Momsen), in a Pucci dress, Low Luv cuff, Dolce Vita shoes, and Carlos Fachi bag, is tempted by a once-in-a-lifetime opportunity to meet Project Runway‘s Tim Gunn. Meanwhile, Serena (Blake Likely) discovers something about her new boyfriend, Colin (guest star Sam Page), that may put an end to their relationship. Tune in to the CW at 9 p.m. EST Monday night to watch the dramatic episode, and click through the photo gallery now for head-to-toe credits of what everyone will be wearing!