Katie Cassidy returning to 'Gossip Girl' for finale

“Arrow’s” Katie Cassidy is reprising her role as Juliet Sharp for the series finale of “Gossip Girl.” Could she turn out to be the infamous blogger?

Ew.com reported today that Cassidy was spotted on the set in New York City yesterday and the site confirmed that she would be in the series finale. No other details have been released, but producers promised fans that the mystery of Gossip Girl’s identity would be revealed this season and Juliet seems like a good candidate.

In Season 4, Juliet met Nate (Chace Crawford) at Columbia University. But she was more than just a potential love interest for Nate. Juliet had a serious vendetta against Serena (Blake Lively) stemming back to one of Serena’s time away from Manhattan. Juliet blamed Serena for her brother going to jail and she had a whole creepy surveillance board in her apartment. At one point she teamed up with Jenny and Vanessa to work against Serena, but then it turned out that Lily (Kelly Rutherford) had manipulated the situation that had led to Juliet’s brother going to jail.

Could Juliet be back to finish what she started or is there another reason she’s returning to the Upper East Side? Leave your best guesses in the comments below.

“Gossip Girl” airs Mondays at 9:00 p.m. EST on The CW.