November 08, 2011 08:00 AM

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Talk about an unforgettable moment — Dylan Walsh reveals he welcomed a baby daughter named Amelie Belle earlier this fall.

“My best moment of 2011 would definitely be the birth of my daughter six weeks ago, on Sept. 25,” the actor, who stars with Poppy Montgomery in the CBS show Unforgettable, tells PEOPLE.

Added the new dad, “Yep. Six weeks old. Not a whole lot of sleep happening at my apartment.”

Walsh, who turns 48 next week, is perhaps best known for his role on the FX show Nip/Tuck.

He filed for divorce from his second wife Joanna Going, mother of Stella, 8 this month, last year and has two other children — Thomas, 15, and Joanna, 14 this month, with ex-wife Melora Walters.

— Sara Hammel with reporting by Caryn Midler

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