Buckingham Palace and other famous London landmarks turned pink in support of the UK's leading breast cancer research charity.
Nelson's Column, the Tower of London and the BT Tower were bathed in a rosy glow along with the Queen's official London residence.
The event marked the launch of the charity Breast Cancer Campaign's action month, which aims to raise awareness about the devastating disease throughout October.
Baroness Delyth Morgan, Breast Cancer Campaign's chief executive, said: "Twelve thousand women still die from breast cancer every year in the UK. Millions more - survivors, their friends and families - are living with its impact every single day.
"Whilst much progress has been made in diagnosing and treating the disease, there is still so much more to do before we can say we've beaten it."
She added: "Throughout October, everyone can do something to help: from wearing it, buying it, turning it or painting it pink, through to encouraging friends and family to be more aware of the signs and symptoms - every action will help move us closer to curing the disease."
Other London landmarks being lit up pink included HMS Belfast, Somerset House, Tower 42, the Blue Fin Building and Heron Tower.
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