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Khloe Kardashian is confirmed as the new co-host of The X Factor USA.

She will be joined by co-host Mario Lopez when the first live show airs in November.

Described by Simon Cowell as "the worst kept secret in Hollywood", rumours had already been circulating that the pair would front the singing competition.

Khloe Kardashian rose to fame on a reality show about her family, Keeping Up With the Kardashians.

On The X Factor's website she says: "I'm so thrilled to become a part of The X Factor family.

"I've been a big fan of the show and look forward to working with Simon and all of the judges. It's going to be so much fun.

Lopez adds: "Khloe and I have been friends for years and I know we'll be a great team and have a blast."

They replace former T4 presenter Steve Jones, who only lasted one series fronting The X Factor USA.

In addition to their reality shows the Kardashians have launched books and clothing and fragrance lines.

Simon Cowell is joined on the X Factor USA judging panel by Britney Spears, L.A. Reid and Demi Lovato.

The second series of the programme, which is shown on ITV2, has suffered from lower viewing figures.

However, critics have been broadly positive about the contributions made by Spears and Lovato to the judging process.