Finland's prime minister says she has taken a drugs test after videos emerged this week of her at a "wild" party with friends in a private home.
Speaking a news conference in Helsinki, Sanna Marin insisted she had never used illegal drugs.
"I have today taken a drug test and the results will come within a week. Never in my life have I used drugs," the married mother-of-one told the media.
Ms Marin added that her ability to perform her duties was unimpaired during the night in question, apparently a few weeks ago, and that she would have left the party had she been required to work.
It comes as a newly-released video reportedly showed her dancing closely with a Finnish pop star in a nightclub at a separate event about a fortnight ago.
Previous social media clips showed Ms Marin, who at 36 is among the world's youngest leaders, playing to the camera and dancing with friends.
One of the people in the videos is believed to shout out a slang term for cocaine, according to Finnish site Iltalehti.
A video showed six people dancing and mimicking a song in front of a camera, including Ms Marin.
Later, she is seen on her knees on what seems to be the dance floor with her arms behind her head dancing while singing.
She has previously been quoted as saying she had nothing to hide, she did not see any drug use at the party, and that the videos were meant to be shared just among her group.
The party is said to have taken place at private flats and several Finnish media personalities appeared in the clips.
"I'm disappointed that they've become public. I spent the evening with friends. Partied, pretty wild, yes. Danced and sang," Finland broadcaster YLE quoted her as saying.
"I have not used drugs myself, or anything other than alcohol. I've danced, sung and partied and done perfectly legal things," Ms Marin added, according to the Hufvudstadsbladet newspaper.
Many people in the country have expressed support for the young leader for combining a private life with her high-profile career.
But critics have pointed out that Finland, which has a 832-mile-long land border with Russia, currently faces issues related to the Ukraine invasion, including high electricity prices.
The country recently asked to join NATO after it dropped its neutral stance.
And newspaper Helsingin Sanomat said the party episode raised questions about her judgement.
"Marin may have acted in good faith, but this gullible she should not be," the paper wrote in an editorial.
"The prime minister can, in a sensitive situation, put the weapons of information warfare in the hands of those who would like to hurt Finland," the newspaper said.