You know that look Nicole Kidman always seems to have, the one that says, "I'm a frigid bitch with a stick up my ass, don't even try to make me smile because my botoxed face might crack"? Well, for now at least there's a reason behind that look: Girl's not getting laid.

Gossip enabler FemaleFirst reports:

Nicole Kidman has put a sex ban on her fiancé Keith Urban.

The 'Cold Mountain' actress has told the country singer they won't have sex again until their wedding night - which is rumoured to be taking place in a few weeks time.

A source told Britain's Daily Sport newspaper said: "Going four weeks without sex will certainly increase the passion on their wedding night."

Nicole reportedly got the sex ban idea from her friend Russell Crowe. The 'Gladiator' star went for months without sex before he married Danielle Spence in 2003.

Russell said: "I was determined there would be a lot of pent-up energy on the big night."

Nicole is due to marry the country singer Urban in a chapel near Sydney on June 25.

We're not quite sure what the big deal is in Nicole giving up sex for a measly month. She was married to Tom Cruise for ten years, for chrisssake. To Nicole a month without sex isn't exactly like a dog going a whole day without licking his balls. That would be miraculous.

You won't have to go without self-love once you see Nicole naked at MrSkin.com.