Sport Relief is under way, with stars of sport and entertainment coming together for a very special weekend.
Stars including Gary Lineker, Davina McCall, Dermot O'Leary and Claudia Winkleman are presenting a live show on BBC One that will run to 0130 GMT.
On Sunday the weekend's activities culminate with about one million people expected to run the Sport Relief Mile across the country.
People can still enter a Sport Relief Mile to get involved this weekend.
The money raised will be spent by the Comic Relief charity to change lives across the UK and the world's poorest countries - you can donate to help make a difference.
Friday's show will feature a host of special sketches, with some hilarious guest appearances.
Absolutely Fabulous returns with a unique Sport Relief twist as some truly fabulous guest stars join Edina and Patsy, including Kate Moss, Stella McCartney, Emma Bunton, David Haye, Linford Christie and Colin Jackson.
There will also be an Outnumbered special featuring Frank Lampard and Christine Bleakley, while Miranda Hart finds herself playing a game of tennis at the Royal Albert Hall with outrageous consequences. The sketch is littered with famous sporting faces, including Robbie Savage, Michael Owen, Roberto Mancini, Tim Henman and Goran Ivanisevic.
Strictly Come Dancing finalists Harry Judd and Chelsee Healey reunite with their partners and take to the dance floor, only this time the dances will all be performed under water.
The cast of Benidorm face the wrath of Simon Cowell and the rest of the Britain's Got Talent judges as they put together a cringe worthy boy-band routine, and even the royal family are getting involved as Zara Phillips joins Sir Steve Redgrave for a one-off Twenty Twelve sketch.
Amir Khan and Jermain Defoe will also do their bit as they add their own touch to a Horrible Histories special and Mo Farah will take on BBC Online's favourite Misery Bear in their very own take on classic fable The Tortoise and the Hare.
David Walliams, Helen Skelton and John Bishop, who have all taken on epic challenges, will be live in the studio on the night as we hear more of what they went through in the name of Sport Relief.
Lifelong non-swimmer Frank Skinner will be putting himself to the ultimate test in the name of charity as he tackles his very own Everest, swimming 25 metres, and cricketing legend Andrew Flintoff will be attempting a Guinness World Record live in the studio as part of his Flintoff's Record Breakers challenge.
The night will also include a unique musical performance from The Rugby Choir, made up of past and present players who were trained by JLS and vocal coach Zoe Tyler and performed live at Twickenham as part of their training in front of thousands. And some familiar faces from the England football team will be taking on an egg-straordinary Saturday Kitchen Omelette Challenge.
Go to the BBC Sport Relief website for more news, information and videos.