The actor and Robin Sue Hertz Hempel are set to wed

Credit: Courtesy Daniel Baldwin and Robin Sue Hertz

He put a ring on it!

Actor Daniel Baldwin popped the question to entreprener Robin Sue Hertz Hempel on Saturday at the Fort Lauderdale Film Festival, his rep confirms exclusively to PEOPLE.

The actor, who is sober, says he “slipped the ring into a glass of cranberry juice” to surprise his future wife, 48. “Upon finding the ring amongst the ice, Robin exclaimed, ‘Yes!’ ”

The sparkler, designed by the actor himself, features nearly five carats with a marquise-cut diamond accented by baguette diamonds.

“I couldn’t be more overjoyed Robin said yes,” says the star, 54. “Next to the birth of my children, this is the happiest day of my life.”

Baldwin is dad to daughters Kahlea, 30, Alexandra, 20, Avis, 6½, and Finley, 5, as well as son Atticus, 18, from previous relationships.

The couple, who have been together for a year, attended the film festival this weekend to promote The Wisdom to Know the Difference, a movie Baldwin stars in, wrote and directed.

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