TV father knows best ' at least when it comes to approving boyfriends.

As Full House's Danny Tanner, Bob Saget, along with the rest of America, watched Mary-Kate Olsen and Ashley Olsen grow up in the shared role of his youngest daughter, Michelle Tanner.

These days the wildly successful 22-year-old twins make headlines for their fashion sense and their boyfriend choices. Mary-Kate has been dating N.Y.C. artist Nate Lowman, 29, for 10 months, while Ashley has been seeing National Treasure actor Justin Bartha, 30, for 5 months.

"I approve of anyone that makes my friends happy, and they're my friends," Saget, Valentino Rockstud Shoes 52, told PEOPLE at "Cool Comedy, Hot Cuisine," a benefit for the Scleroderma Research Fund at Caroline's in New York on Tuesday. "I am protective of the people I love."

The same sentiment was recently shared by the Olsens on Oprah. "If she doesn't like him, I won't like him," Mary-Kate said of Ashley's taste in men. "If she likes him, I'll like him."

Saget's former costars have shown equal support for his adventures in dating. "They've approved of my girlfriends," he said.

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