Grey's Anatomy Season 12 Episode 17 Sneak Peek: Wilmer Valderrama Guest Stars, Owen Learns Riggs Bought Amelia a Drink

Coming up on Grey's Anatomy Season 12, Episode 17, "I Wear the Face" airing THURSDAY APRIL 7, 8|7c, Meredith goes on an ambulance ride with Owen and Nathan to pick up a heart for a transplant patient. Musician and multiple sclerosis patient Kyle Diaz (guest star Wilmer Valderrama) is admitted to Grey Sloan Memorial with a tremor in his hand, and the residents apply for the Preminger Grant. Meanwhile, Catherine Avery continues to insert herself in Jackson and April's business, against husband Richard's wishes.

RELATED: Read the Episode 16 "When It Hurts So Bad" Recap »

In the Grey's Anatomy sneak peek below from "I Wear the Face," Meredith is stuck in the back of an ambulance with Owen and Nathan, who hate each other more than ever. Owen is still upset after being dumped by Amelia, and when it comes up that she's an alcoholic, Riggs is shocked. He reveals he bought her a drink awhile ago, and she never told him she had a drinking problem. Owen is furious, and Meredith has to play referee. She tells them to cut it out til the job is done, they can kill each other later.

In a second sneak peek, Kyle Diaz (Wilmer Valderrama) checks into the hospital with a hand tremor that's affecting his guitar playing. But while Amelia and residents Blake and Edwards are trying to discuss his treatment options, the smooth-talking musician seems more interested in flirting with Stephanie. Watch the scene now!

Watch Grey's Anatomy THURSDAYS 8|7c on ABC, or catch up on Season 12 episodes of Grey's Anatomy and read Grey's Anatomy Season 12 episode recaps.