Stalker costars Dylan McDermott and Maggie Q are engaged after a whirlwind romance, Us Weekly can confirm -- get the details! Credit: Jon Kopaloff/FilmMagic

Stalker soul mates! Dylan McDermott and Maggie Q are engaged after a whirlwind romance, Us Weekly can confirm.

An insider tells Us that McDermott, 53, actually proposed months ago, only recently gifting her with a ring while spending time in Hawaii. "No wedding date set yet," the source says.

Us confirmed back in October that the Stalker costars were dating after the two were spotted having a romantic night at Santa Barbara's Olio e Limone. "They were very flirty, smiling at each other, canoodling," an onlooker told Us at the time. "At one point she was feeding him at the table."

McDermott and the Insurgent actress, 35, have yet to comment on their relationship. McDermott was previously married to actress Shiva Rose for 14 years until their split in 2009. The exes share daughters Colette, 18, and Charlotte, 9. This will be the first marriage for the Nikita alum.

Page Six was first to break the news.