Khloe Kardashian leaves X Factor USA after one series

Reality TV star Khloe Kardashian will not be returning to The X Factor USA a year after joining the show as co-host.

Fox television also confirmed that presenter and actor Mario Lopez would return for a second year.

A spokesman said Kardashian, who appears in Keeping Up With the Kardashians with sisters Kim and Kourtney, would not be back.

"We really enjoyed working with her and wish her all the best in the future," the spokesman said.

Kardashian, one of the most popular faces on US television, was brought in by X Factor creator Simon Cowell last year as part of a revamp.

That included the hiring of singers Britney Spears and Demi Lovato as judges after a disappointing first season in 2011.

The original panel included Paula Abdul, Nicole Scherzinger, L.A. Reid and briefly, Cheryl Cole.

'Not an easy job'

L.A. Reid announced in December that he was leaving after two series and Britney Spears quit in January after one season.

Their replacements have yet to be named but Demi Lovato will be back in September with Simon Cowell.

Kardashian married basketball player Lamar Odom in 2009 and the pair landed their own spin-off show.

L.A. Reid (left) and Britney Spears (second right) have now left X Factor USA

She has more than eight million followers on Twitter and has been in the news in America for several months over the couple's efforts to have a baby.

Lopez, a former actor, is the co-host of entertainment magazine show Extra and radio show On with Mario Lopez.

He is also an author of several fitness books.

"I'm thrilled Mario is back for Season Three of The X Factor," Cowell said in a statement.

"Hosting a live show and keeping the judges - especially Demi - in line, is not an easy job, but Mario is a pro and we are glad he's coming back."

British presenter Steve Jones left X Factor USA after its first series.

Follow @BBCNewsbeat on Twitter