Video: Jason Alexander Battles the Bulge with Jenny Craig

Former "Seinfeld" star Jason Alexander reveals to ET what made him turn to Jenny Craig this year to meet his weight loss goal.

Jason is the newest spokesperson for the weight loss program and joined Jenny Craig client (she’s still on their maintenance program) Valerie Bertinelli in a commercial about the program. The TV star says after turning fifty and still carrying about 40 pounds too much, he decided it was now or never.

"I gained 15 pounds with each child. I did sympathy weight gain with my wife. She had babies [and] so she got it off. Mine stayed on," he says, also attributing some of his weight gain on his "Seinfeld" stint. "Every year that we got more successful, our catering got more elaborate. ... and it's boredom eating."