Chris Martin has joked his wife Gwyneth Paltrow is his "beard".

The Coldplay front-man - who has long been reluctant to talk about his relationship with the Oscar-winning actress, with who he has children Apple, seven and Moses, five - admitted he does not like to discuss Gwyneth while on 'The Ellen Degeneres Show' but joked he is secretly gay and uses her as his "beard", a term used where a woman pretends to be married to a man because he is hiding his sexuality.

Ellen said: "You have had a great relationship and two precious kids. And we love Gwyneth. She's been here many times," to which British-born Chris responded: "She's been a great beard for me now, for 10 years."

Ellen added: "Is that right? It's not really a real relationship?" and Chris responded: "Yes, it's hard to believe."

Chris - who lives in London with Gwyneth - recently admitted he felt like he had won the lottery when he got with his now-wife.

He said: "It's a big leap? What, from being a loser to going out with an Oscar winner? It's a giant leap. Let's face it, it's like winning the lottery."