Jennifer Aniston Credit: Lester Cohen/

Is Jennifer Aniston joining Kate Middleton in the first-time moms club? Not yet.

A new tabloid cover story claims that the actress, 43, and her fiance Justin Theroux are expecting their very first child. But Aniston's rep tells Us Weekly that the Wanderlust star is not pregnant.

The latest tabloid story? "It's crap!" the rep says.

Regardless, Aniston and her husband-to-be, 41, are all set to have a very merry holiday season indeed. Over the weekend, the couple welcomed a bevy of A-listers - including Demi Moore, Ellen DeGeneres, Tobey Maguire and Ben Stiller -- into their massive L.A. mansion for a tree trimming party. The Friends alum selected a 10-foot Noble Fir Premium tree at Beverly Hills' Mr. Greentrees for the season.

"She likes [her trees] really full and fluffy!" the store source explains of Aniston's 2012 tree, which was delivered last week.