The TV personality looked stunning as she showed off her toned figure in a leather mini skirt and matching crop top.
But the star appeared to skip picture opportunities outside the venue, as her co-stars were snapped greeting the waiting crowds, with Alesha nowhere to be seen.
The launch also saw Bruno Tonioli officially join the panel as a new judge, following David Walliams departure.
She’s back! Alesha Dixon flashed her torso in a cut-out leather co-ord on Tuesday as she returned to the Britain’s Got Talent judging panel
Alesha looked stunning in a long-sleeved leather top with a cross-over design, teamed with a matching mini skirt.
Her dark locks were left to fall freely in a sleek straight style as the beauty added a collection of chunky gold necklaces.
Fellow judges Simon Cowell and Amanda Holden greeting the crowds outside of the London venue and grabbed pictures there alongside hosts Ant McPartlin and Declan Donnelly.
But Alesha and new judge Bruno appeared to skip crowds on arrival, as they were spotted for the first time when walking to their judging seats.
Your judges! The launch also saw Bruno Tonioli officially join the panel as a new judge, following David Walliams departure
Inside the auditions, Ant and Dec introduced the four judges to the stage as they walked out to Survivor’s Eye Of The Tiger.
Alesha gave Bruno a warm welcome as she egged him on to give the red buzzer a push to test it out, giving him a hug after he did so.
And dazzling in a shimmering red suit, Bruno jested that Simon has ‘teased’ him with the job for years, one fan filmed from the audience as Bruno told the audience: ‘Thank you very, very much. I am thrilled to be here.
Turning to Amanda and Alesha, he continued: ‘Look at these girls, they are stunning. And my old friend Simon, what an honour it is to finally work with you, he’s teased me with this for years, years and years and years.
Excited: Looking forward to the day of auditions, Alesha shared an Instagram Reel to her Stories showing dancers giving a performance on Tuesday morning
‘Honestly, I am thrilled to be here. Emotional, and very, very nervous.’
While Alesha shared an Instagram Reel to her Stories showing dancers giving a performance on Tuesday morning.
‘This is the kind of energy I want to see from anyone auditioning for @bgt today,’ she wrote on the post.
Amanda looked typically stylish on as she arrived to the launch, which was held in Soho, London.
Amanda Holden puts on a leggy display in a stylish blazer dress as she was snapped on arrival
Slim: Simon Cowell continued to look unrecognisable as he arrived at the Britain’s Got Talent launch alongside Ant McPartlin and Declan Donnelly at the London Palladium on Tuesday
The TV personality, 51, displayed her toned legs while sporting a chic blazer dress to kick off the talent show once again.
She was the second judge to arrive at the after Simon Cowell, who flashed a thumbs up to the crowds.
The duo are kicking off the auditions alongside returning judge Alesha Dixon and brand new addition Bruno- who took to the panel seat for the first time.
Amanda opted for a denim blue blazer dress with a shoulder pad and single-breasted design for the first day of auditions.
She teamed the ultra-mini number with a pair of glossy black platformed heels, adding a collection of gold jewellery.
Beauty: Amanda opted for a denim blue blazer dress with a shoulder pad and single-breasted design for the first day of auditions
Glamorous: The judge had her creamy blonde locks styled in a soft curl as she opted for a glamorous palette of makeup
The judge had her creamy blonde locks styled in a soft curl as she opted for a glamorous palette of makeup.
The media mogul added that a doctor warned he’d had ‘the worst diet he’d ever seen,’ and he’s ‘stuck’ to his new regime by cutting out pies, red meat and gluten.
Extra touch: Amanda added a selection of gorgeous jewellery to her look, including a Van Cleef and Arpels clover bracelet
Looking good! Simon arrived moments before Amanda and showed off his recent 3st weight loss, looking very slim in an all-black ensemble
A man of the people: He wrapped an arm around one fan while smiling for a selfie
One fan was extra happy to see Ant as they leaned in for a cuddle with the presenter, leading the duo to break down in fits of giggles.
Stocked up: A crew member appeared to be carrying a bag of drinks for Simon as she walked behind him
There they are! Also among the first to arrive were long-standing hosts Ant McPartlin (left) and Declan Donnelly (right)
Giggling: Ant was mobbed by the crowds as soon as he arrived which he appeared most amused by
Loving it: Ant was left in stitches of laughter as fans mobbed them
On Monday, it was claimed that Amanda and Alesha were refusing to sign contracts for the latest series of the show.
The duo are said to be furious that Bruno will see his new salary match their own – an estimated £850,000.
Selfie? Dec greeted adoring fans as he got stuck in and smiled for selfied with the crowd
Popular: The duo certainly aren’t short of fans, as fan Heidi Sargent even sported a custom Ant and Dec bomber jacket and picture collage dress
According to The Sun, Amanda and Alesha sent the latest series into chaos with bosses scrambling to secure the TV favourites ahead of filming beginning in London next week.
A source told the publication: ‘Amanda has been on BGT for 17 years, while Alesha is going into her eleventh year. They don’t think it’s fair a newcomer could walk into the show and be handed the same deal as them’.
‘It’s a bit of a headache for BGT given filming for the next series begins at the London Palladium on Tuesday’.
‘Bruno was still ironing out his contract on Friday too so it’s all very much down to the wire’.
Superfan: Her dress was decorated with different selfies and pictures both with and of Ant and Dec
Patient: A crowd of fans began to queue early on in London’s Soho for tickets to the auditions
MailOnline contacted reps for Amanda, Alesha and ITV for comment.
Bruno, who is said to be ‘delighted’ to return to Saturday night prime time TV in the UK, will now overshadow his former Strictly co-stars wage by three times.
Venue: The London Palladium in Soho, London, where the auditions are being held
Back in business: The famous BGT lorry sat in the central London location as things kicked off for another year
Early bird! Fans can get free tickets to watch the judges and acts in action on a first-come, first-served basis
Shirley Ballas, Craig Revel-Horwood, Motsi Mabuse and Anton Du Beke are all believed to earn £250,000 per series on the Strictly judging panel.
It comes following battle between Bruno – a close friend of Simon’s – and comedian Alan for the role. The show’s judges Alesha and Amanda were told the identity of their new colleague in the last week.
According to the Daily Mail’s Katie Hind, Bruno is yet to sign the contract but the job has been formally offered to him following at tug of war between ITV and BGT boss, who insisted that he had the role following David’s departure.
Alan, 46, is understood to be ‘devastated’ at losing out on the job which he thought was his.
The new BGT judge has been revealed: Bruno Tonioli’s friend Lizzie Cundy accidentally ‘confirmed’ he is the new signing on Instagram on Tuesday ahead of the official announcement from ITV – (Bruno is pictured on the far right)