Britain's Got Talent 2013: Simon Cowell's secret booster seat revealed

PUBLISHED: 20:35 EST, 30 January 2013 | UPDATED: 04:32 EST, 31 January 2013

In need of a boost: Simon Cowell has been spied using a cushion on his chair at Britain's Got Talent auditions

Simon Cowell has been caught using a cushion to make him appear taller while sitting down filming Britain's Got Talent.

The music mogul, 53, was seen with a 'booster seat' on his chair, making him appear as tall as the rest of the judging panel.

Simon, who is thought to be around 5ft 7 shares the panel with David Walliams who is 6ft 2, as well as Alesha Dixon and Amanda Holden.

An audience member at the Glasgow auditions spotted the implement and told The Sun: 'We went down the front to get a photo during one of the breaks and noticed the booster seat'.

'It's Simon down to a T. He's a small man with a big opinion and a big personality.'

A spokesperson for Simon told MailOnline: 'He is using a cushion for comfort.'

Simon is often seen using a Cuban heel to boost his height and he covers the shoes with long baggy jeans.

Booster seat: An eagle eyed audience member spotted the cushion seen in Simon's chair

And in a recent Twitter snap taken by an audience member showing Simon kissing David's back, the comedian is seen towering above the X Factor boss.

The Syco boss has been mocked about his height by former judge Piers Morgan in the past.

Piers said: 'If you look carefully, Simon grows between shows.'

Sitting pretty: The 53-year-old music mogul appears to be as tall as 6ft2 comedian David Walliams

Towering above him: In this Twitter snap Simon is dwarfed by David Wallliams and is seen kissing the comedian's back

'When we're on Britain's Got Talent, he's smaller than me, then suddenly his three pillows arrive and he's taller than me.'

While Cowell might have issues in the height department, he certainly isn't in short of money as he was named the biggest earner in a new rich list for reality television.

He topped the chart with an estimated £225million, making ten times more than second placed Susan Boyle.