Jennifer Lopez and Demi Lovato are amongst the guest stars who will perform on Britain's Got Talent.
J-Lo will return to the UK to sing her new track Live It Up, while Demi - a judge on the US X Factor alongside Simon Cowell - will showcase her new single Heart Attack.
Ellie Goulding, Olly Murs and last year's BGT winner Ashleigh and Pudsey will also take to the stage for the upcoming episodes.
The final 45 acts will perform to win the public vote in the live semi-finals for the ITV show beginning on May 27, before the live final on June 8, where the winner will be crowned.
The champion of the series will win £250,000 and a spot performing at this year's Royal Variety Performance.
Some of the acts that have made it through to the next round of the live stage include singer Aliki Chrysochou, eccentric Dutch singer Maarty Broekman, impressionist Philip Green and Labrinth's brother, DJing drummer MckNasty.