Marc Anthony is set to mentor on The X Factor US.

The singer-songwriter has reportedly signed up to be a celebrity adviser on the hit TV talent show. Marc's alleged involvement in the series comes after it was confirmed that Justin Bieber would be teaming up with judge L.A. Reid ahead of the live shows.

According to TMZ, Marc "recently inked a deal with the FOX talent show to join the cast as a mentor for Simon Cowell's group of music hopefuls... the pair has been friends for years."

Nick Jonas is said to be helping out new judge Demi Lovato.

"Demi and Nick go way back, Demi's pretty good friends with all the Jonas brothers and she even brought Nick out as a special guest on her tour recently," a source told British newspaper The Daily Mail last week.

Britney Spears' fellow mentor is yet to be confirmed.

The X Factor's hosting spot is also still vacant after Welsh presenter Steve Jones was dropped after last year's series. A number of high-profile names have been mentioned, including Khloé Kardashian who is being "seriously considered" for the job.

Kevin McHale, Mario Lopez, Stacy Keibler and Kelly Osbourne are also thought to be in the running.

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