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Jude Law lost track of how many children he's fathered during a Thursday appearance on "Late Show With David Letterman." (Watch a clip of Law's slipup.)

The actor, 36, has three children with ex-wife Sadie Frost, and became a Dad for the fourth time this September, when his ex-girlfriend Samantha Burke gave birth to their daughter, Sophia.

Check out a photo of Jude Law as a kid!

But little Sophia didn't cross his mind while chatting Thursday about his holiday plans. "I usually try to take the children on a bit of an adventure," Law told Letterman of his traditions. (This year, he says they're relaxing on a beach.)

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When the late-night comedian followed up to ask "how many kids?" Law replies "three," and fails to correct himself.

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When Burke, a 24 year-old aspiring actress, announced her pregnancy in July, Law initially disputed the paternity claims. The Oscar-nominated star soon came around, and his rep released a statement confirming that he was the father, and that he intended "to be a fully supportive part of the child's life."