Aniston 'tells friends of amazing sex'

Jennifer Aniston has reportedly told her friends that she is having an "amazing" sexual relationship with Gerard Butler.

According to Heat, Aniston spoke of the fling while in Cabo San Lucas, Mexico for her 41st birthday.

A source claimed: "Jen invited only her closest friends, and she was the belle of the ball. How could she be anything but on top of the world.

"She says the sex is amazing. They have great chemistry across the board - sexually and intellectually."

The source added: "In past relationships, she was always so stressed and focused on where it was going and how long they'll be together, and whether they were exclusive. But with Gerard she decided to enjoy it and not have any expectations."

Aniston is alleged to have toasted herself at the party by saying: "Here's to me! I'm happy, I'm successful, I've got great friends. And on top of it all, I'm damn hot."

Last July, Butler admitted to being frustrated by the "ridiculous" rumours about him and his Bounty Hunter co-star Aniston.