Boyband The Mend, 12-year-old Lauren Thalia and 'Lost My Keys, Lost My Phone' rapper Mr Zip will be among those taking to the stage to be judged by David Walliams, Alesha Dixon, Amanda Holden and Simon Cowell.
Also in the first semi-final lineup are Scientologist swing band The Jazz Aces, dance troupe UWS, soul singer Rachel Knowland and violinist Analiza Ching.
Dog act Ashleigh & Pudsey and 133-strong choir Only Boys Aloud complete the acts for tomorrow's show.
The full list of semi-finalists was revealed at the end of tonight's (May 5) final auditions episode.
The Britain's Got Talent semi-finals will be spread over five consecutive days this week, with the final airing next Saturday (May 12) from 7.10pm.