The Saturdays are to team up with Manchester United for a charity fundraiser in aid of Sport Relief.
The girls will be singing at a pre-match concert at Old Trafford on 1 May.
The music will warm up the crowd before a star-studded match between a Manchester United XI and a team called "The Rivals".
The Rivals team will feature a mixture of Manchester United legends and celebrity fans, including actor James Corden and rugby star Matt Dawson.
The day is being called United Relief Live and anyone who wants to go to the event will be able to buy tickets.
It's one of a series of events that have been planned as part of Sport Relief.
One of them saw Blue Peter's Helen Skelton take on an epic challenge of rowing the entire length of the Amazon River in South America.