September 20, 2011 04:00 PM

Thomas Janssen/Pacific Coast News

They grow up fast. Just look at Tiffani Thiessen‘s daughter Harper Rennonly 15 months old but already getting set to take on the world.

“She’s talking up a storm,” her proud mom told PEOPLE Sunday at the Nautica Malibu Triathlon. “Not walking anymore, now running. She loves swimming now. That’s her big thing. She loves to get in the pool with us.”

The White Collar actress, 37, says the changes have been fast and furious lately.

“From the 12-month to the 15-month mark has probably been her biggest stretch of [milestones],” she says. “She’s not a baby anymore. It’s funny.”

If Harper changed Thiessen’s life, giving birth to her also changed her body.

“It’s a new kind of body,” the actress says. “I don’t think after having a baby you go back to exactly what your body was before. And I’m totally okay with that. I’m kind of loving the more voluptuous look that I’ve got these days.”

Thiessen ran a leg of Sunday triathlon, but her exercise regimen is quite varied.

“I weight train. I run,” she says. “And I’m getting back into yoga again, which I did a lot when I was pregnant. I like to change it up. My whole thing is doing something different all the time.”

— Tim Nudd

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