Finnish Prime Minister Sanna Marin has taken a drug test after video footage emerged earlier this week showing her partying with friends.

"I have today taken a drug test and the results will come within a week," she told a news conference. "Never in my life have I used drugs."

The leader added that her ability to perform her duties always remained unimpaired, and that she would have left the party had she been required to work. 

But the world's youngest serving government leader said she felt pressure to undertake a drug test from politicians in her government coalition as well as from the opposition, after the videos went viral.

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Video clips of Marin, 36, singing and dancing with well-known Finnish influencers and artists began circulating on social media this week and were soon published by several media outlets in Finland and abroad, despite being posted to a private Instagram account.

Marin has stated that the video was a compilation of clips from two separate occasions a few weeks ago.

The Prime Minister acknowledged that she knew she was being filmed but never thought the videos would become publicly available.

"These videos are private and filmed in a private space. I resent that these became known to the public," Marin told Finnish media, adding that she she did not know who leaked them.

Many Finns have been voicing their support for the young leader for combining a private life with her high-profile career. But newspaper Helsingin Sanomat said the episode raised questions about her judgment.

"Marin may have acted in good faith, but this gullible she should not be," the paper wrote in an editorial.

The Prime Minister has remained firm in stating that people at both events were consuming alcohol but that no one took drugs, to her knowledge.