Swimmer Michael Phelps has made history by becoming the only Olympian EVER to win eight gold medals at a Games.
Phelps was part of the American team that won the 4x100m medley event.
He held off Australia and Japan along with his team-mates Aaron Peirsol, Brendan Hansen and Jason Lezak, to win in three minutes 29.34 seconds.
The record for the most medals was previously held by another American swimmer Mark Spitz, who won seven golds at the 1972 competition in Germany.
Phelps said: "I don't even know what to feel right now.
Phelps with his team-mates
"There are so many emotions going through my head and so much excitement. I kind of just want to see my mom.
"Without the help of my team-mates this isn't possible."
The 23-year-old has swum 17 times over nine days, and set world records in seven finals.
He had already won the 400m medley, 200m freestyle, 200m butterfly, 4x100m free relay, 4x200m free relay, 200m medley and the 100m butterfly.
The win brings the total number of Olympic medals Phelps has won during his career to 16 medals overall - including 14 golds.