Wilmer Valderrama admitted to Grey's Anatomy

Actor Wilmer Valderrama is heading to the hospital for a multi-episode arc on Grey'S Anatomy.

The That '70s Show star has been cast as a character called Kyle Diaz, but further details on his mysterious role have yet to be revealed.

According to Variety, Valderrama will appear in a number of episodes for the medical drama's current 12th season - with his first set to air in April (16).

Valderrama is currently on hiatus from director Robert Rodriguez's horror series From Dusk TIll Dawn, which has been renewed for a third season. The actor also starred in the small screen adaptation of sci-fi series Minority Report, but the show was effectively canceled after just 10 episodes last year (15).

He follows in the footsteps of his girlfriend Demi Lovato, who also appeared as a guest star in an episode of Grey's in 2010. The singer/actress played a teen who had been diagnosed with paranoid schizophrenia, but it was later discovered she suffered from a rare condition of the inner ear.

Demi, who has dealt with her own mental health issues, talked about her gig on Grey's to E! News in 2010, gushing about landing a role on her favorite TV show.

She said, "I'm a huge fan (of Grey's). Obsessed and it's not healthy... Everyone has been super, super sweet to me and really welcoming. At like six o' clock on a Monday morning, I walk in and (former star) Patrick Dempsey's like, ‘Hello there, Demi…How do you say your name?' And I was just like, ‘Oh! There's Patrick Dempsey' and there was a huge smile came on my face."