Gossip Girl is bringing back Lily's sister.

Well, she's never really been around until now, except briefly in the ill-fated ’80s based spinoff episode. Anyway, she's is about to surface on the Upper East Side in 2011!

According to TV Line, Illeana Douglas of Ghost World, Ugly Betty and Six Feet Under has been cast in the potentially recurring role of Lily’s older sister Carol.

Krysten Ritter played the character in the Season 2 flashback episode, "Valley Girls," which also served as a pilot for the spinoff the CW ultimately passed on.

Douglas is slated to debut in early April and, according to a Gossip Girl insider, she won’t be coming to town alone. What do you think that little teaser means?

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