Big stars such as David Beckham, Kylie Minogue, Sebastian Coe and David Walliams are trying to raise £50m for charity as part of Sport Relief.
The 6-hour BBC show will include celebrities doing comedy sketches, challenges and special performances to try to raise the money.
Football legend David Beckham will be starring in the first Only Fools and Horses in ten years while comedian David Walliams will be grilling other footballers in a special edition of Mastermind.
As well as that, Lord Coe goes head to head in a series of sporting events with comedian John Bishop and Kylie Minogue will perform her 1988 duet Especially for You “with a surprise singing partner” (Ooh!)
Gary Lineker and Davina McCall will help host the show, which is raising money for poor and disadvantaged people in the UK and around the world.
The programme is being broadcast from London’s Queen Elizabeth Olympic Park and aims to beat the record £50.4m raised during the last Sport Relief two years ago.
Don’t forget to give as much money as you can to help. It’s all for a great cause.