Thousands of people crowded into London to cheer on the heroes of the Beijing Olympics and Paralympics.
Cyclist and triple gold medal winner Chris Hoy led the victory parade of around 350 athletes, on 12 trucks.
He said: "Today is just unbelievable. But in two or three weeks' time, I'll be getting back in training, and looking forward to London 2012."
It's the first time Olympic and Paralympic athletes have celebrated their successes together.
Double gold medal winning swimmers Rebecca Adlington and 13-year-old Paralympian Ellie Simmonds were on the final float of the parade.
Tom Daley missed lessons to be there, and said: "This is a pretty big day really and the school lets us off if we have a big day."
Team GB had their most successful Olympics in 100 years at Beijing, winning 19 gold, 13 silver and 15 bronze medals.
The ParalympicsGB team were Britain's best for 20 years, winning a whopping 102 medals and finishing second in the medals table, behind China.