Jessie J is deciding on a dare for Holly Willoughby to do as part of 'Comic Relief'.
The biennial BBC One telethon takes place next month and in a bid to raise as much money for the charity as possible, celebrities will be doing dares set up for them by other stars.
So Holly will be given a challenge by Jessie, who is shaving her hair off for the cause.
Speaking on ITV's 'This Morning', Holly said: "I'm doing a dare actually. I don't know yet, I don't know what it is - its a surprise one! Jessie J is daring me to do something and I don't know what it is yet, [I find out] maybe this week I think..."
'Comic Relief' is celebrating its 25th anniversary this year and Jonathan Ross - who has been involved with the charity since it started - is currently in Ghana seeing how the money will help people in the third world.
He said: "I am live down near the coast here in Ghana at a mother and child centre. We are basically seeing where some of the money that's been raised over the last 25 years of Red Nose Day is being spent. the children are being brought here for developmental check ups and also that are going to be given a vaccination against the rotavirus - which is a form of diarrhoea that the children can get and its a big cause of death for the under five's here so its very important."
"There'll be a million vaccinations being given out across Africa thanks to 'Comic Relief', so it's a million potential lives we're saving."