Cowell appears with Mezhgan on Jay Leno (VIDEO)

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 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."