Jason Alexander's Cringe-Worthy Jenny Craig Ad 2.51K Adrian Muniz 02/08/10 02:19PM Filed to: Jason Alexander Jason Alexander Advertising Commercials TV Video In case you were wondering, the Seinfeld curse is alive and well. You may have been nominated for an Emmy, Julia-Louis Dreyfus, but Jason Alexander wasn't. He's currently losing weight in the girliest way possible.