Who can toss their hair highest? Kelly Brook and Amanda Holden battle it out to be Britain's Got Talent's most glamorous judge

You could be forgiven for thinking they are in a competition, rather than judging one.

Kelly Brook and Amanda Holden had the hairdryers out and the high heels on this week - even though it was just a rehearsal for their show, Britain's Got Talent.

The pair, both judges on the ITV programme, seem to be vying for the title of prettiest on the panel.

Miss Holden, 37, wore a very short skirt by an Australian designer, Yeojin Bae, and a pair of skyscraper heels designed by singer Jessica Simpson.

Miss Brook chose a slashed black frock - and had given herself a full head of curls.

There has already been talk of rivalry between the pair, though model and presenter Miss Brook, 29, only joined the show on Monday.

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'The rehearsals looked as if they had turned into a fashion show,' an onlooker said.

'Both Kelly and Amanda looked perfectly groomed. There was not a hair out of place.'

Miss Brook was brought in by judge Simon Cowell to sit alongside him, Piers Morgan and Miss Holden.

Her appointment is bound to draw comparisons to when Cowell signed Cheryl Cole as the fourth judge on the
X Factor.

Much was made of possible jealousy between the Girls Aloud singer, 25, and older judge Dannii Minogue, 37.

Miss Brook signed her contract late on Monday night just hours before she started filming.

ITV producers flew the brunette to Manchester on Tuesday morning to start work on the set, her agent confirmed.

A source told MailOnline former Strictly Come Dancing star Brook was 'excited' about her newest venture.

The model-turned-actress is no stranger to television - she's previously presented The Big Breakfast, Celebrity Love Island and, more recently, Dirty Dancing: The Time Of Your Life on Living TV.

Miss Holden also arrived in Manchester on Tuesday after returning from her honeymoon in the Maldives with Chris Hughes, who she married on December 10 at Babington house in Somerset.

The third series of Britain's Got Talent is due to air from May.

The winner will take home a £100,000 prize and the chance to perform at the Royal Variety Performance.