"These videos are private and filmed in a private space. I resent that these became known to the public," Marin told reporters in Kuopio, Finland as quoted by CNN.

"I spent a night with my friends. We just partied, also in a boisterous way. I danced and sang," she said.

 Sanna Marin is facing massive backlash after a leaked video of her dancing wildly and partying hard with friends has gone viral.

In the footage, presumed to be taken from social media, she and friends including Finnish celebrities are seen dancing and singing.

She has faced criticism from opposition parties, with one leader even demanding that she take a drug test.

Marin, 36, denied taking drugs, saying she only drank alcohol and just partied "in a boisterous way", BBC reported.

Formerly the world's youngest head of government, Marin, 36, has always been open about partying and has often been photographed at music festivals.

Last year, she apologised for going out to a club after coming into close contact with a Covid-19 case.