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Reese Witherspoon

Jon Kopaloff/FilmMagic

Reese Witherspoon and agent beau Jim Toth are one cute couple.

So what's the secret to their red-hot romance?

Don't ask Reese. She says she knows diddly-squat about being in love...

"I'm just old enough to know now that I know nothing," the 34-year-old Oscar winner told reporters last night at the L.A. premiere of her new romantic comedy How Do You Know. "Because I think when you are young you think you know everything and now I have just realized, you know, anything's possible."

And what would her life be these days without a question or two about Robert Pattinson, her costar in the upcoming drama Water for Elephants?

"He was wonderful," said Witherspoon, who was looking quite beautiful in a Zac Posen dress. "He's a really great actor. He just has an incredible work ethic. He works so hard and it was really fun."