Simon Cowell blushed as he was grilled by Jay Leno about his relationship with Mezhgan Hussainy.
The X Factor judge admitted on The Tonight Show With Jay Leno that he had bought the American Idol make-up artist a ring.
Asked "Are rumours you're engaged true?", Simon replied: "Are they true? Well, I do have somebody in my life now, Jay, yes, and I kind of made a decision this year to make somebody happy."
Quizzing Simon about the ring Mezhgan has been pictured wearing on her wedding finger, Jay joked: "I thought she broke her arm."
Simon said: "It's quite a big one, yes."
Teased by Jay, Simon confessed: "I am blushing. I find this very uncomfortable. I was asleep, I think. No, look, I bought her the ring in London."
Jay spotted Mezhgan, 36, in the audience and invited her to come on stage to join Simon, 50, and the pair sat together looking loved-up.
When the chat show host asked if he would be invited to the wedding, Simon joked he could be a flower girl.
The music mogul said he wanted a wedding "in the next 10 years" and added: "I'm kind of torn because I'm a bit too old to have kids, but then again I think it would be important to have a lot of me's around in the future."