Nick Jonas from the Jonas Brothers is going to star in a huge, one-off production of the musical hit Les Miserables at the O2 Arena.
The singer will be joined by comedian Matt Lucas for the special event to celebrate the show's 25th birthday.
They're part of a cast of 300 that will perform on 2 October at the massive music venue.
That night there will be three different performances of the hit across London.
As well as the O2 event, the regular show will go on in the West End, while another special anniversary version will happen at the Barbican theatre where the hit started back in 1985.
In 2006 Les Miserables became the world's longest-running show.
It's had over 10,000 performances and has been seen by more than 56 million people.