March 13, 2010 12:15 PM

Matthew McConaughey is a famously laid-back guy. But what about his girlfriend, and mother of his two kids, Camila Alves?

“I try to keep [life] as simple as I can,” Alves, 27, tells PEOPLE in a new interview. “I try to keep it as calm as I can.”

As a mom to son Levi, 20 months, and daughter Vida, 9 weeks, Alves is juggling motherhood, her career as a handbag designer, her relationship with McConaughey and her latest gig, as host of Bravo’s Shear Genius. It’s that anything-goes mentality that keeps her sane. “The word ‘stress,’ I don’t believe in that,” she says.

In fact, she’s reveling in motherhood – and enjoying watching her kids grow up. “Every stage they go through, it is something different and new and exciting,” she says of her kids. “Levi’s so much fun! He’s just into everything. He’s repeating everything … putting words together.”

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