John Barrowman worries I'm A Celebrity fans with unrecognisable appearance on Extra Camp

John Barrowman worried I'm A Celebrity fans this evening after his appearance on Extra Camp.

The 52-year-old looked almost unrecognisable as he sported shaved gray hair on the ITV2 spin-off show.

And fans flocked to Twitter to comment.

One tweeted: "John Barrowman looking unrecognisable on #ExtraCamp #ImACeleb."

While another commented: "Not trying to be rude but is John Barrowman okay? He looks completely different, didn't recognise him at first #ImACeleb #ImACelebExtraCamp #ExtraCamp."

John Barrowman looked unrecognisable tonight (Doug Peters/EMPICS Entertainment)

John appeared on Extra Camp this evening (ITV)

A third questioned: "Has John Barrowman been poorly ? #ExtraCamp."

Another wrote: "What the hell, John Barrowman looks and even sounds so different #ImACeleb #ExtraCamp."

"John Barrowman has had a rough year. What the hell has happened to his hair. #ImACeleb #ExtraCamp," one remarked.

Fans couldn't believe how different he looked (ITV)

He appeared on the show alongside Alison Hammond (ITV)

Another wrote: "John Barrowman had aged about 10 years in one year #ExtraCamp."

A fan insisted: "that can't be John Barrowman #ExtraCamp."

But another wrote: "John Barrowman is now a silver fox!! #ImACeleb #ExtraCamp."

While another remarked: "Omg John Barrowman fully grey #ExtraCamp."

*I'm A Celebrity returns tomorrow at 9pm on ITV