About 15,000 women wearing decorated bras have walked a marathon-length route through the night to raise money for breast cancer care and research.
Thousands of women wear decorated bras on the Moonwalk
The women, and some men, began the annual event late on Saturday in Hyde Park, central London and arrived back from about 0600 BST.
TV presenter Lorraine Kelly and model Nell McAndrew were among those on the Playtex Moonwalk, which began in 1998.
Founder Nina Barough has herself suffered from breast cancer.
Ms Kelly said: "Breast cancer is something that touches so many of us - a lot of us have had a relative or a close friend who has had it.
"Walk the Walk raises so much money it's fantastic. The event aims to raise as much cash as possible while having fun at the same time."