Longoria, 41, and José "Pepe" Bastón, 47, are set to say "I do" this weekend after dating for nearly three years, WHO has learned.
A source confirms to WHO that the wedding will be held this weekend, in Mexico, and the guest list will be glittering because the couple is "expecting half of Hollywood to be there."
David and Victoria Beckham, Penélope Cruz, Ricky Martin, Katy Perry, Mario Lopez, Prison Break alum Amaury Nolasco and Jane the Virgin's Jaime Camilare on the high-wattage invite list.
Longoria and Bastón first stepped out as a couple in November 2013, and Bastón, who is president of Latin media brand Televisa, popped the question to the actress while on vacation in Dubai in December by presenting Longoria with a stunning ruby engagement ring.
The former Desperate Housewives actress previously opened up to WHO about her relationship with Bastón, saying, "He was the most handsome man I'd ever seen. He was so charismatic, charming, sweet and funny. I thought, 'Who is this guy?!' "
This is Longoria's third marriage. She was previously married to actor Tyler Christopher and NBA star Tony Parker.