This rumor comes to us courtesy of famed celebrity gossip blogger Perez Hilton, so make of it what you will. It would be pretty wild if this actually went own.

According to Perez, Hilary Duff will reprise her role from last season as Dan's ex-girlfriend and movie star extraordinaire, Olivia Burke, in the season finale!

Not only that, but Clemence Poesy (Eva) AND Katie Cassidy (Juliet) are both also apparently returning to the UES for the last episode of the show's fourth season.

We haven't been able to independently confirm this report, but we welcome your theories on whether you think it'll happen - and whether it should, and how ...

What could possibly bring all three of these memorable characters back to the Upper East Side - and why isn't Michelle Trachtenberg's Georgina Sparks included in this rumor?

UPDATE, 4/8: Duff will not appear, according to new reports.

However, Michelle Trachtenberg has been spotted on set, and Desmond Harrington is set to make yet another appearance as Jack Bass. Awesome ...

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