Tonight, James makes his debut on US television as the new host of The Late Late Show and joining him are the likes of Hollywood actor Tom Hanks and Jupiter Ascending star Mila.
During his chat with Mila, it seems James finally manages to uncover the truth behind those wedding rumours, getting the starlet to show off her wedding ring to his audience!
While chatting to Mila, conversation soon turns to her relationship status and James continuously asks the US beauty if she is or isn't 'Mrs Kutcher' yet.
Mila coyly replies: "Maybe".
According to the Daily Mirror, James presses on telling the mum-of-one "either you're married or you're not" and when Mila continues to keep quiet, the Into The Woods star demands to see her wedding finger - which happens to have a ring sitting pretty on it.
Taking that as proof, James tells the crowd: "They are married, look!"
Rumours of Ashton and Mila tying the knot first came about at the start of the year, after Ashton posted a cryptic photo on Facebook with the words "Happy New Year [love] The Kutchers" written into the sand.
Fans instantly took his photo to mean the pair had finally wed, but known for being notoriously private, neither Ashton or Mila confirmed so.
Since then, Mila has continued to act coy, telling Ellen DeGeneres in February she had no idea what Ashton had meant by "The Kutchers".
"I don't know, it could just be a plural," Mila suggested. "My daughter has his last name legally, thus there are multiple Kutchers. He has a brother?"
Ashton, meanwhile, threw a spanner in the works when he referred to Mila as his fiancée still, shortly after her appearance on Ellen.
While speaking at a tech conference, he said: "Last week I was walking with Mila Kunis - who's my fiancée.... We were walking and I had baby Wyatt strapped to me. She's beautiful."
Now, it seems though, the cat is finally out of the bag (thank you James Corden!).
The Late Late Show airs tonight on CBS.
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