The Prime Minister’s home temporarily turned pink yesterday as part of Breast Cancer Awareness Month.
Lights were projected onto the exterior of Number 10 Downing Street and placed inside the windows from 5am until 8am.
Number 10 and Breast Cancer Campaign jointly organised the illumination.
"Tackling cancer is a priority for this government and we want to raise survival rates to be among the best in Europe," said Prime Minster David Cameron.
"I hope seeing 10 Downing Street go pink will inspire other people to get involved."
Breast cancer is the most common cancer in the UK, with more than 48,000 people diagnosed each year.