McFly have visited Africa to spend time with children for Comic Relief.
The boyband are singing the official song for the charity and they went to find out more about how Comic Relief money is spent to help people.
They visited children who are affected by Aids, and many of them have lost one or both parents. They also went to medical centres and slums in Kampala.
The boys were clearly affected by their first trip to Africa. "It has just been incredible," Danny said.
At one point Danny broke down in tears when a little girl had an injection in a medical centre they went to.
"That was quite tough," he said afterwards. "I just saw a kid getting an injection for malaria and it was just I was holding her hand - it was a little moment that upset me."
The lads also went to a school which has been helped by Comic Relief. The school gives free lessons and meals to children in the local area. McFly sang one of their songs to the pupils there, who clapped and sang along.
This was one of the best parts of the trip for the boys. Tom said: "Hearing a whole school of kids here singing a song that you've written is amazing . Very emotional."
Harry added: "You literally sang one line and they picked it up - just like that. All of them."
On their four-day trip, McFly also filmed their music video for their double A side Red Nose Day single. It's out on Monday and all profits will go to Comic Relief.