Meow… Girl fight! What is going on with Christina Aguilera lately? Her divorce, her slipping career, she is on some sort of weight gaining roller coaster and although I loved ‘Burlesque’… I don’t think anyone else did.

Now Christina is fighting with co-star, Julianne Hough, at an after party. It’s getting messy. The story goes…

The confrontation took place Friday at a party hosted by CAA at the Soho House in West Hollywood attended by the likes of Julia Roberts, Colin Firth, Ashton Kutcher and Demi Moore. Ryan Seacrest, Hough’s boyfriend and a CAA client, was not present.

But Aguilera was, and she apparently wasn’t too psyched to see Burlesque costar Hough.

“Christina really got in her face,” an eyewitness told E! News, saying that Aguilera unleashed a verbal barrage at Hough.

Onlookers said Aguilera even grabbed Hough, leading the Dancing With the Stars hoofer to snap, “Don’t touch me!”

Before the two separated, Aguilera threatened to torpedo Hough’s burgeoning country singing career. Hough was said to be “visibly upset” by the incident, according to one insider. “The whole thing was troubling. People felt bad for Julianne.”

Aguilera’s rep, however, described the report as “nonsense.”

Where was Ryan? Although Aguilera could totally take him down!