Photo ExclusivePatrick Dempsey Debuts His Twins!

EXCLUSIVE! The Grey's Anatomy star shows off the newest additions to the McDreamy brood, his newborn boys Sullivan and Darby

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THREE IS ENOUGH

With three little ones in the house, Dempsey says, "I think we're done now." As for how daughter Talula is handling big sister duties? Dempsey says not only did his 5-year-old help determine the boys' names, she's "very excited and very good about taking care of her brothers."

For more on Patrick Dempsey's twins, pick up the latest issue of PEOPLE, on newsstands Friday.

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