WILL & JADA: IT'S OK TO CHEAT IF YOU ASK FIRST

Will Smith & Jada Pinkett

Will Smith has discovered the secret to a happy marriage -- if he's going to cheat on wife Jada Pinkett, he says he'll first ask for her permission!

The hunky "Hitch" star admits that he was tempted by sexy costar Eva Mendes.

Will and Jada, married for seven years, came up with the unusual open-marriage plan after looking at other Hollywood couples and figuring out why they ended in divorce court.

After chatting with Tom Cruise and Nicole Kidman, as well as Bruce Willis and Demi Moore, the duo came to the conclusion that it's not the extramarital sex that breaks up marriages -- it's the lying and secretiveness that goes with it.

"Our perspective is, you don't avoid what's natural," Smith told a reporter. "You're going to be attracted to people. In our marriage vows, we didn't say 'forsaking all others.'

"The vow that we made was that you will never hear that I did something after the fact.

"If it came down to it, then one can say to the other, 'Look, I need to have sex with somebody. I'm not going to if you don't approve of it -- but please approve of it.' "

HOT FOR EVA
Even though he admits that he's hot for Eva, who he calls "freakin' gorgeous," he said his heart will always belong to his wife.

"I don't let a day go past that Jada doesn't feel like the queen of the world," Will said.

"I make sure every single day that she knows how I feel about her."