Reese Witherspoon is all set for a low-key Mother’s Day this weekend.

She’ll be lunching with her mom, Betty Reese, and kids, Ava, 8, and Deacon, 4. But as a paparazzi target, the Oscar winner knows she can’t count on a disruption-free holiday, even though she’s careful not to reveal a single specific detail about their plans — not even the state.

Despite that obvious drawback of fame, she still sees some pluses — and so do her kids. They have “always kind of known me to be who I was, and if people know Mom at the grocery store, I think they kind of like it,” says Witherspoon, 32. “Obviously, if you’re not having the greatest day, it’s not always easy, but for the most part, (fame) brings a lot of positive things into our life.”

Among them, she says, is her role as global ambassador for Avon. Her duties include honorary chairwoman of the Avon Foundation, which focuses on breast cancer, domestic violence and emergency relief. On Sunday, she hit the pavement for the last mile of the Avon Walk for Breast Cancer’s Washington leg. The walk raised more than $8 million for research and outreach.

“I’ve always been very focused on creating positive images and doing things to give back to women,” Witherspoon says.

And she says the spirit of helping is rubbing off on Ava, who traveled to New Orleans with her for this year’s Idol Gives Back special.

“She has a very giving spirit, so it’s great to encourage that,” Witherspoon says. “There’s a great responsibility to educate your children and show them what’s important in life, which includes giving back.”

Although she wouldn’t discuss supposed beau Jake Gyllenhaal or ex-husband Ryan Phillippe, Witherspoon gushed about her Four Christmases co-star Vince Vaughn.

“He’s great! He’s so funny,” she says.

Vaughn, known for improvising on set, proved to be a valuable ad-lib partner for Witherspoon in the comedy, due at Thanksgiving.

“We had a great time riffing off each other,” she says. “Sometimes I would just cry from laughing so hard.”

Source: USA Today