The former The Bold and The Beautiful soap star, 52, will marry 23-year-old Shawna Craig at a hotel in Cabo San Lucas on 30 April (11).
The wedding will mark the fifth trip down the aisle for Lamas, who admits he will be keeping the nuptials small and intimate.
He tells Us Weekly, "It's going to be amazing. We found a beautiful hotel in Cabo and we're in touch with the general manager to make it really, really special. It's gonna be small - we're not inviting a lot of people. It will be just family and friends."
Lamas' ex-wives include former Playboy Playmate-turned-actress Shauna Sand, who he divorced in 2002.