Is Jennifer Aniston pregnant? She is not yet showing if she is.

Is Jennifer Aniston pregnant with fiance Justin Theroux's baby?

A report from the National Enquirer cites her mom Nancy Aniston as the source of the revelation, and the story in this week's tabloid also claims the upcoming wedding will be in Mexico.

Celebitchy has some of the text from this week's print edition and more here.

The photo above is from a recent film shoot and Jen shows no baby bump, so if she is pregnant, she is not yet showing.

More on Jen's upcoming wedding...pregnant or not, yet another ex-boyfriend is saying he is "happy" she has got engaged.

Paul Sculfor - who she dated in 2007 - couldn't be more delighted for the former 'Friends' star.

He said: "I'm happy for her, I'm happy she's finally found someone she likes because everyone should in the end, shouldn't they?"

Was Jen surprised by the engagement?

Meanwhile, friends of Jennifer and Justin say she was "completely" surprised when he asked her to marry him on his birthday earlier this month as the actress - who was previously married to Brad Pitt - had given up expecting a proposal after it didn't happen when they vacationed in Europe at the beginning of this summer.

A source told Grazia magazine: "Jennifer did not see this coming. She had hardly seen anything of Justin in the weeks leading up to the proposal and the distance had been putting a strain on the relationship. So, when he proposed, she was overjoyed.

"It truly was the most incredible surprise and she didn't hesitate in saying yes."

Image: Bang Showbiz