Kunis was spotted wearing a gold band on her left ring finger during an appearance on 'The Ellen DeGeneres Show'.
Degeneres pulled up a cryptic photo posted by Kutcher on New Year's Eve which first sparked the marriage rumors during their chat.
"It's my duty - I'm your friend - but it's my duty as a talk show host to ask you the question if you're married because (Ashton) posted this so it means something, I would think," she told Kunis.
Ellen said, "It says 'The Kutchers' so it sounds like you're married."
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Kunis kept silent and responded with a sly smile. Ellen then declared, "I'm gonna say yes."
The actress then said, "I don't know, I don't know. We could just be a plural. My daughter has his last name, legally. So there's multiple Kutchers. He has a brother that is a Kutcher."
Kunis, 31, and Kutcher, 36, welcomed daughter Wyatt Isabelle four-months ago.