Alesha Dixon stuns in a leggy thigh-skimming dress and fishnet tights as she steals the spotlight on the first Britain's Got Talent live semi-final

Alesha Dixon put on a leggy display in a thigh-skimming dress during the first semi-final of Britain's Got Talent  on Monday.

The former MisTeeq singer, 45, returned alongside fellow judges Simon Cowell, Amanda Holden, and Bruno Tonioli when the live shows of the ITV1 competition kicked off.

She opted for an off-the-shoulder number but styled out her whole outfit with a pair of eye-catching leggings that came with a netted texture.

The whole outfit was completed with a pair of silver high-heeled sandals that sparkled as they caught the light.  

The Boy Does Nothing hitmaker was all smiles as she took to the stage at London's Evntim Apollo as her new red locks tumbled around her shoulders.

It was the first time the former Strictly Come Dancing winner had debuted such a hairstyle, having previously sported a much darker do. 

Meanwhile, Alesha's co-star Amanda also looked glamorous in her one-shoulder gown which featured sleeves with attached gloves.

The garment's material gathered to the front but it was for another reason that fans of the show focussed their attention on the dress - many took to social media to note that they could see her nipples through the material.

They joked it must have been cold in London's Hammersmith Apollo where the semi-final was taking place. 

One person wrote on Twitter: 'Live shows baby!!! First live show and Amanda already has her nips out. Fantastic.'

While someone else joked: 'Amanda has a couple of things that are live.'

Another viewer posted: 'Shoutout to Amanda Holden's nipples.'

After six weeks of Britain's Got Talent auditions, the live semi-finals kicked off on Monday as eight acts competed with one another in the hope of landing themselves a valuable place in Sunday’s grand finale.

A further eight entrants will feature each night of the week before the final, with two acts from each evening making it through – one decided from a public vote and the second decided by the judges.

The winner will get a life-changing £250,000 cash prize and a spot on the bill of the Royal Variety Performance. 

The eight acts who performed on Monday night were Sven Smith, The Trickstars, Trey Braine, Sslaubi Performance Troupe, Taryn Charles, Bikoon, Stardust and Innocent Massuki.