PIC: See Rebecca Romijn's Twin Girls' Adorable New Ad!

Credit: John Shearer/WireImage.com

Rebecca Romijn isn't the only model in the family!

On Monday, she unveiled her second "Got Milk?" ad -- and it stars her adorable 1-year-old twin girls, Dolly and Charlie.

The ad is a part of Got Milk's "Great Gallon Give" campaign, which emphasizes the importance milk plays in building strong families. The campaign also promises to donate hundreds of thousands of gallons of milk to families in need. (For every "virtual" gallon passed on Facebook and other sites, $1 will go to Feeding America.)

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"I know that milk is a valuable part of building a stronger family," Romijn, 37, says. "For me, milk is the best choice. It supplies so many nutrients that are important for my children's development -- and to my overall health, too. I encourage all moms to make it easier to build a strong family in 2010 by setting their table with milk."

Look for the ads in magazines - including Us Weekly! - beginning Jan. 15. For exclusive behind-the-scenes footage, visit WhyMilk.com.