Jennifer Aniston - Aniston Considering Oliver's Cookbook Challenge?

JENNIFER ANISTON is considering challenging MARTHA STEWART as a U.S. culinary queen after British chef JAMIE OLIVER told her to get serious about her cooking obsession.

Oliver is reportedly staggered by the actress' kitchen know-how - and he's urging her to come up with a cookbook.

A source tells the National Enquirer magazine, "Jen prides herself on planning dinner parties for friends and has dozens of recipes she's come up with on her own.."

And Oliver has been a friend of the star ever since Aniston hired him to cook up a feast for her ex-husband Brad Pitt's 40th birthday.

The insider adds, "They are always emailing each other. He sends her new recipes to try and she shares some of her favourites with him."