Jenny Craig spokesperson VALERIE BERTINELLI goes native when she heads to the beach in Hawaii, puts on her wetsuit and grabs a surfboard to film her latest commercial for the weight-loss program -- and ET is right there with the beach bunny.

"I lost 40 pounds on Jenny Craig and I have reached my ideal size: surfer girl size," the former "One Day at a Time" star declares. "I can't believe I am surfing again."

Valerie's new Jenny Craig commercial begins airing on Monday, April 21.