Her ex might be expanding his brood but Jennifer Aniston has no plans to follow in that direction, at least not yet. The former Friends star's rep is shooting down reports that she is pregnant.

The National Enquirer has reported that the 38-year-old actress is pregnant and the father could possibly be Vince Vaughn, Paul Sculfor, or Jason Lewis.

"She is not pregnant," her rep tells Usmagazine.com

The reports stated that Aniston allegedly admitted she is pregnant with her first child saying, "I'm having a baby!" And a picture of the actress wearing a loose top and large scarf, which celebrities usually wear to hide a baby bump, had fueled the rumors even more.

But a source tells Us that the former Mrs. Pitt sipped a martini at a Christmas Eve dinner with best friend Courteney Cox and husband David Arquette at a resto in Beverly Hills. She had also colored her hair last week, a beauty step that is greatly discouraged to pregnant women.

She "is in great mood," the source says. "There's no drama, that's why she's happy!"

Aniston is also rumored to have moved in with Lewis and spent the Christmas together with his family in Los Angeles.

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