There’s a mayjah catfight brewing between two of the hottest socialites on Manhattan’s Upper East Side. These days, the drama on The CW’s cult favorite Gossip Girl hangs around long after the cameras have stopped rolling, TV industry tattles tell Hollywood Life.com. Word is 16-year-old beauty Taylor Momsen is green with envy that G.G. co-star Leighton Meester is getting lots of free promo for her forthcoming album, courtesy of show producers, while Momsen’s own tracks have yet to receive a single spin on the show.

Taylor’s grunge band, The Pretty Reckless, is signed to Interscope with an album expected to drop sometime next year. Leighton’s solo album — featuring collaborations with Cobra Starship, Lil Wayne, and Robin Thicke — is set to debut on Universal Republic in early 2010.

Gossip Girl has played Leighton’s songs “Good Girls Go Bad” and “Somebody to Love” on two episodes this season, but have never played any of Taylor’s songs. The CW even premiered Leighton’s debut music video for “Somebody to Love.”

“Taylor is not happy that Gossip Girl has been playing Leighton’s music on the show, and they have never asked to play any of her songs. It’s creating a lot of tension on set,” a spy divulged to Hollywood Life.