He’s famed for his caustic put-downs on American Idol and The X Factor but Simon Cowell showed a very different side to his personality as he shared a kiss with fiancée Mezhgan Hussainy on the Tonight Show, reports dailymail.co.uk.

After weeks of trying to deny their engagement, the 50-year-old finally confirmed the couple is getting married.

When asked by Jay Leno about the engagement rumours a flushed Cowell replied: “Are they true? Well, I do have somebody in my life now, Jay, yes. And I kinda made a decision this year to make somebody happy.”

Pointing out Hussainy’s huge $385,000 diamond engagement ring, Leno joked: “I thought she broke her arm.”

The X Factor judge was rumoured to have proposed to Hussainy, 36, on Valentine’s Day, but he refused to clarify how it took place.

He said: “I find this very uncomfortable. I was asleep, I think. No, look, I bought her the ring in London.”

Leno then further embarrassed Cowell when he spotted the make-up artist in the audience and invited her to join her fiancé on stage.

Pretending he had never met her, Cowell offered to shake hands with his bride-to-be, with Hussainy heard saying: “Nice to meet you.”

After receiving a playful slap on the hand from his fiancée, Cowell pulled her towards him by her neck for a quick kiss on the lips.

Contradicting reports he will wed this summer, Cowell said he wanted a wedding “in the next 10 years.”