Jessica Szohr and Taylor Momsen won\'t be series regulars on the New York-set teen drama, \"Gossip Girl,\" next season, EW.com reported. The actress\' departures come after their characters were missing for much of the current fourth season. Kaylee DeFer, who debuted during this season of the show, will be a permanent member of the cast when the series returns for Season 5 in the fall, EW.com said.