Watch 'Oz' Star Michelle Williams on 'Baywatch' When She Was 13! [Video]

Before she was an Oscar nominee, before she was Glinda the Good Witch in "Oz the Great and Powerful," and even before she was breaking hearts on "Dawson's Creek," Michelle Williams enjoyed some beach time on "Baywatch."

[Related: 'Dawson's Creek': Where Are They Now?]

Yes, in 1993, a 13-year-old Williams -- who is getting rave reviews for her portrayal of the pure and benevolent Glinda in "Oz" -- made her acting debut on the lifeguard drama. She played Bridget Bowers, a popular girl at Hobie's school who didn't invite him to her party. When he and Mitch (David Hasselhoff) see her on the beach, the dad pushes his son to talk to her.

"Oh yeah, you're the boy who always has sand in your shoes!" Williams says. Watch her scene:

The onscreen crush turned into real-life romance when Williams dated Jeremy Jackson, who played Hobie, for two years.

"We messed around," he told Howard Stern on the host's radio show. "She was kind of like my first crush, puppy dog love."

Funnily enough, Williams's "Oz" co-star Mila Kunis also appeared on "Baywatch." She mentioned the two cameos in an interview with a starstruck reporter that went viral earlier this week.

Watch one of Kunis's "Baywatch" scenes: