THE X Factor star Tabby Callaghan has wowed fans by looking unrecognisable 15 years after appearing on the singing competition.

The star has ditched his signature red dip-dyed hair for a noticeably shorter brunette style as he continues to perform across the UK.

ITVTabby looks unrecognisable compared to his X Factor appearance '/caption '

instagramThe star appears to have switched to a more clean-cut hairstyle '/caption '

Rock star Tabby, now 40, originally rose to fame on the first ever series of The X Factor, which hit our screens back in 2004.

He auditioned alongside his band DZ5 - but when the judges were left unimpressed with the rest of the group, re-auditioned alone.

Tabby sang Bon Jovi hit Keep The Faith for the judges - Sharon Osbourne, Louis Walsh and Simon Cowell - who gave him three ...yes' votes.

The Irish singer went on to finish third in the competition behind vocal troupe G4 and winner Steve Brookstein, who went on to release a number of hit singles.

He went on to star in a fly-on-the-wall documentary following his TV appearance ahead of the release of his first album, Number One.

Tabby's single soared high into the Irish charts - later following up with a second successful hit, Gotta Get Control, in 2011.

The vocalist was well-known on the show for his signature black locks, which had been dip-dyed red at the ends much like his X Factor coach, Sharon.

But since The X Factor, he has ditched the dark coloured hair and swapped it for a more natural brunette hue, as well as cutting his locks back short.

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The star continues to perform, both as a solo artist and with various bands, frequently sharing his music to fans on social media.

He also looks to have hit the gym - frequently flexing his muscles in social media posts as he spends time in the studio.

Tabby isn't the only X Factor star who has shocked fans with their appearance years after taking part in the hit show.

Earlier this month, we revealed what champion Leon Jackson looks now after he won the show and moved to LA to pursue a music career.

The scotsman, 32, shot to fame on the fourth season of the ITV competition in 2007 and made it all the way to the final.

His winner's single When You Believe placed at number one in the UK charts and sold a whopping 400,000 copies.

instagramTabby is seen flexing his muscles in the studio as he continues to perform '/caption '

News Group Newspapers LtdThe Irish star rose to fame in the first series of The X Factor '/caption '