Mark-Paul Gosselaar will guest star on <em>Weeds</em> Sources at Showtime confirmed today that Mark-Paul Gosselaar will be joining Weeds for an upcoming one-time only guest appearance opposite Mary-Louise Parker. He will play a local bar owner who gets romantically involved with the drug dealing mother.

This news comes from E! Online, who also mentioned that drummer Tommy Lee will play himself in an upcoming episode of Californication. David Duchovny will encounter the notorious rocker singing at a local hotel bar.

The Mark-Paul Gosselaar episode of Weeds is set to premiere on August 16th at 10 p.m. Tommy Lee's Californication airdate has yet to be announced.