They might have been Hollywood's hottest young couple, but Reese Witherspoon said she was "ridiculously young" when she married Ryan Phillippe in 1999.

The recently re-married Witherspoon told UK Elle magazine that she learned a lot from the marriage to her "Cruel Intentions" co-star, whom she met at her 21st birthday party in 1997.

PHOTOS: STARS WHO FALL IN LOVE ON SET

The pair have two children, Ava and Deacon, both of whom were there when Witherspoon tied the knot with Jim Toth last weekend.

"I was so, so young," she said. "I learnt a lot though. It was an excellent opportunity for me to really find out what it means to be a partner and to be in a marriage and it's not anything that I thought it was."

The two split in October of 2007, but Witherspoon said she realized a valuable lesson for her second marriage.

"You can't say, 'I don't want to talk about that,'" she said. "You just can't. You've got to talk about it all."

Witherspoon gets in touch with her sexy side. (Ben Hassett/Courtesy of UK ELLE)

Despite a two-year relationship with Jake Gyllenhaal that ended in 2009, the Oscar winner sounded relieved to have finally found the one … again.

"I think dating is inherently complicated, anyways; what I do for a living makes it even more complicated," she told the magazine. "Let's just say I'm happy to not be dating. I met a wonderful man. I feel really really lucky."

With a great man at her side, that's one less thing that the actress has to worry about – which is important for someone who said her worst trait is a worrier – no matter how successful of an actress she is.

"I'm in my head a lot and I … worry," she said. "I know it's bad for me and I know I shouldn't do it, but I do."

After all, being an actress in Tinseltown means that judgment never ends, she said.

"It doesn't ever stop," she told the magazine. "Judging. Rejecting. They can really kick ya, you know? You're constantly criticized. It's really hard to pick yourself up everyday."

nmandell@nydailynews.com