Gossip Girl is really upping the fashion ante this season.

Famed celebrity stylist Rachel Zoe - also the star of Bravo's Rachel Zoe Project - is filming a fun cameo for a future, couture-centric episode of the show we love!

Zoe will appear as part of Blair Waldorf's 20th birthday party story line, and "plays herself and has a handful of lines to remember,” the N.Y. Daily News says.

Designer Cynthia Rowley and Elle magazine's creative director, Joe Zee, will also make guest appearances in the episode, which will be a Gossip Girl fashion bonanza.

The show will also devote two September episodes to Fashion's Night Out, the multi-city charitable shopping event founded by Vogue editor-in-chief Anna Wintour.

In the Season 4 premiere, we saw Eleanor was already busy preparing for the big event, with Juliet involved as well. We can't wait to see this all tied together!

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.