Dancing with the Stars

What do an old-school stoner, a '90s sitcom star, a YouTube celebrity and an Olympic athlete have in common? They're all competing on Season 19 of Dancing with the Stars.

Officially announced on Good Morning America Thursday, the new cast of ABC's long-running dancing competition will include Cheech & Chong's Tommy ChongFresh Prince of Bel-Air alum Alfonso Ribeiro, teen fashion expert Bethany Mota and track and field star Lolo Jones

Dancing with the Stars Season 19: Meet the Cast!

At 76, Chong will be the oldest competitor — but at 72, legendary fashion designer and fellow competitor Betsey Johnson isn't far behind him.

Also dancing for the Mirrorball trophy this season will be Lea Thompson (Mrs. McFly!), Mean Girls star Jonathan Bennett, and former General Hospital heartthrob Antonio Sabato, Jr.

For a complete list of the stars (and "stars") who are competing in Season 19, and to see which pros they're partnered with, click here.

Dancing with the Stars premieres Monday, Sept. 15 at 8/7c on ABC. What do you think of the cast? And which pair will you be rooting for? Sound off in the comments and vote in our poll!