Simon Cowell in trouble as The X Factor USA's latest series sees ratings slump

Simon Cowell (Britain's Got Talent 2013)

There's bad news for Simon Cowell in the US as the American version of The X Factor continues to struggle.

Simon had originally hoped to reach 20 million viewers with the first US show back in 2011, but each subsequent series has so far seen people tuning out.

There's been countless changes to the line up of judges, from Cheryl Cole to Nicole Scherzinger, Britney Spears to Kelly Rowland.

Only Simon himself has appeared on the panel for each of the three series, having chopped and changed the line up with the aim of upping viewing figures.

This week saw the launch of the third season, but just 6.2 million viewers tuned in, with the show being beaten by the American version of Big Brother.

It was down almost 20% on 2012's opener and had almost half of the raw 12 million audience that the first season premiere had two years ago.

A source told the Daily Mirror that US bosses were "disappointed but not downhearted" by the numbers.

However, in better news, Simon is said to be happy with how the British version of the show continues to perform.

Gary Barlow said he hadn't heard from Simon since the new series started last month, and that's a good thing, apparently.

I see Simon twice a year and I think I have seen him twice this year so I think that is probably it.," he said. "I think the silence is a good thing. I feel sorry for productions that get phone calls every day. We get left alone.”

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