The officer was spotted getting into the spirit of the Notting Hill Carnival, an annual event celebrating Britain's West Indian community, by an MC on stage.
"We got a policeman over there with some moves," the MC says.
"Make some noise for the undercover raver."
Twitter user @phemmynice shared a video of the officer's antics, and he was quickly identified as Police Constable Dan Graham.
The officer, from Kingston in London's south-west was dubbed 'Dancing Dan' after appearing on Britain's Got Talent earlier this year.
Despite being eliminated in the semi-finals, he became a social media star, gaining massive support from his fellow officers.
PC Graham has since maintained a profile on social media, often sharing snaps of his dancing and policing duties.
A video of his Notting Hill routine, shared to his Facebook page, racked up more than 300,000 times in 24 hours.