Move over Serena and Blair. Hilary Duff is moving to the Upper East Side.

The former "Lizzie McGuire" star has made some grown-up appearances on shows like "Law & Order" and "Ghost Whisperer" but Entertainment Weekly reports that Duff will be joining a multi-episode arc of "Gossip Girl," the hit CW show.

Lindsay Lohan is feuding with Katie Holmes. The "Mean Girls" star was expecting to appear on the cover of the April edition of Glamour magazine and was left fuming when the coveted front page was given to Katie.

A source said: "Lindsay did a Madonna-themed photo shoot and was totally under the impression it would be the cover."