Usher, Larry David, Jessica Alba advocate for national service jobs

— -- A panoply of celebrities from Usher to Jessica Alba want you to join the fight to create 1 million national service jobs and help stimulate the job market for young people.

"Sign the petition to create a million jobs, or I will come over there and slap you silly," actor Larry David says in a new video promoting a petition being circulated by non-profit Our Time, which focuses on young people's issues. The group is aiming to deliver 1 million signatures in support of the creation of national service jobs to the presidential candidates by Election Day.

Nas, Rachel Zoe, and Trey Songz join fellow celebrities in talking about the difficulties young people face today in finding employment as well as the need to pump more national service jobs into the employment market.