Declan Donnelly found himself at the centre of a funny optical illusion as he greeted King Charles and Queen Camilla on the red carpet on Monday. 

The presenter, 50, joined Ant McPartlin, also 50, in saying hello to the royals as stars of the showbiz world gathered at the Royal Albert Hall to celebrate the King's Trust's 50th anniversary gala. 

In one photo, Dec looked like he was wearing a black pleated maxi skirt and heels as he shook hands with the monarch. 

However, later photos showed the skirt was worn by an assistant of the royals, while Dec looked dapper in a three-piece navy pinstripe suit. 

Ant and Dec will host the event to mark half a century of the charity - formerly titled The Prince's Trust and founded by Charles in 1976. 

The night will bring together King's Trust ambassadors, alumni, staff and volunteers to honour the work of the charity, which supports young people aged 11 to 30 with education, training, and finding jobs.

The evening also celebrates the achievements of the people it has supported over the past 50 years.

Other stars who have arrived at the event include Kate Garraway, Charlotte Tilbury and Gareth Southgate. 

The King set up the charity when he was still the Prince of Wales, using his naval pension at a time when many of his critics believed he should not be getting 'his hands dirty' in this way.

Since then, it has helped more than 1.3 million young people across the UK reach their potential.

Three in four of those it has supported over the last five years have moved into work, education or training.

An all-star line-up including Jools Holland, Sir Rod Stewart, Craig David, Ronnie Wood, Anne-Marie and Skye Newman are expected to perform.

During the celebration, Charles and Camilla will meet this year's King's Trust award winners, accompanied by their award presenters, as well as Trust ambassadors and performers.