Seems like the Christina Aguilera‘s beef with Lady Gaga won’t be squashed anytime soon!

According to a new Star magazine report, Christina is now jealous over Gaga’s new perfume, Fame.

The insider claims, “Christina is threatened by any successful woman, but Gaga really gets under her skin. Christina’s fragrance line is her baby, and she’s extremely territorial – especially since her album sales have tanked.”

Yes, they have, haven’t they? Not even Christina’s  platform on “The Voice” was able to rescue her fledgling career (which may be why she’s decided to take a hiatus from the show after this season).

The source added, “When Gaga first arrived on the scene, Christina predicted she’d be a one-hit wonder. It drives her crazy that she was so wrong. Christina can be really low-class and has been saying she wants to kick Gaga’s ass! [CelebDirtyLaundry.com]