'NCIS' Star Michael Weatherly Reveals 35-Pound Weight Loss

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NCIS fans need to get used to a leaner, healthier Michael Weatherly -- the 46-year-old actor recently revealed he's lost a sizable amount of weight.

"My friend and I have been swimming in the Pacific every weekend [since early May], and I lost 35 pounds!” Michael told Closer Weekly.

Weatherly said he was encouraged to shed the extra pounds partly by his NCIS crew member pals, while training for the Nautica Malibu Triathlon.

PHOTOS: Celeb Weight-Loss Transformations

"I learned that if you say you're meeting someone at 8 a.m. on a Sunday, you have to show up," he said about the serious commitment it took.

He completed the triathlon on September 14 along with other celebs like Teri Hatcher. The course consisted of a one-half mile swim, 18 mile bike and 4 mile run through Malibu, Calif.

"Triathlon? Check. #ncis," he wrote Sunday.

He revealed he's keeping the weight off by staying active with both biking and regular running.

"Hopefully, I'll be able to make my family proud!" he said about his already impressive achievement.

…. Looking good Michael!

VIDEO: Michael Weatherly's Mom on Raising an 'NCIS' Star

Check out Weatherly dishing to ET about the secret of NCIS' incredible popularity worldwide in the video below.