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Sarah Michelle Gellar Reveals the 'Mom' Item She Always Carries

Like all moms, Sarah Michelle Gellar is busy. Between juggling 4-year-old daughter Charlotte, 1-year-old son Rocky and filming new sitcom The Crazy Ones with comedy legend Robin Williams, the mother formerly known as "Buffy" has bigger things than vampires to slay these days—like deadly diseases such as pertussis (aka whooping cough).

The 36-year-old actress (and wife of actor Freddie Prinze Jr.) partnered with her mom, Rosellen, on the March of Dimes campaign, Sounds of Pertussis, which encourages parents and caregivers to get vaccinated against that preventable yet deadly bacterial disease.

We caught up with Gellar, who gave us the lowdown on what it's like to work with Williams and what she always carries with her.

Why she got involved with the campaign...

The greatest gift I've ever been given is my children, and the thought that somebody else's gift could be taken away, that it could be prevented—it's my responsibility to speak out.

What surprised Gellar about her mom once she became a grandmother...

My mom is normally the one that would hide from the family picture, but she loved the idea of being able to help, because my mother was a preschool teacher. She thinks being a grandmother is the greatest gift of all. It's pretty cool we've been able to do [the campaign together].

MORE: Alyson Hannigan's Cure for Sibling Rivalry

How she juggles motherhood and career...

I do the best that I can, that's all I can do. … It takes a village, and I have to learn to ask for help when I need it and do the best that I can both at my work and at home.

What it's like to work with Robin Williams...

He's amazing. I mean, he's an Academy Award-winning, Juilliard-trained, one of the 10 greatest standup comics of all time and one of the nicest human beings I've ever gotten the pleasure to know. And I'm just incredibly blessed and really excited.

Her must-have mom item...

Sanitizer is a good one or any kind of clean hand wipe. Because, man, if a child can touch a floor for any reason, they will touch a floor.

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