Double Olympic gold medallist Laura Trott sprinted to victory in the first ever RideLondon Women's Grand Prix.
She finished a bike length in front of her rival in the 15-lap criterium event around the streets of the capital.
After the race she said: "This feels like my event, I felt I had to win. I'm so glad I did."
Her top tip for other cyclists is to have a jam sandwich in your back pocket to pull out during the race.
The race was part of RideLondon, a huge event to celebrate cycling.
One of the challenges for competitors was a one hundred mile race around London and Surrey.
Thousands of people took part in the event.