Reese Dishes on Love, Rob Pattinson: "Anything's Possible"

Find out what the Oscar winner had to say at the premiere of her new flick, How Do You Know

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."