Finland's government said on its website that the wedding took place at Kesaranta, the prime minister's official residence. It said the couple's family and closest friends attended.
Sanna Marin says she did not take any drugs during a "wild” party in a private home, adding she did nothing wrong when letting her hair down and partying with friends.
In the video clips, thought to be taken from social media, she and friends including Finnish celebrities are seen dancing and singing. She has faced criticism from opposition parties.
Topping this growing list of governments with the greatest gender parity is Rwanda where women make up 61.3% of the lower house.
When one has to wait for an hour for the bus to arrive, when one has to join a kilometre-long line to get the car refuelled, when one has to barter clothes to buy food,
So Sanna Marin, the 36-year-old Finnish PM who just last week was dubbed “the coolest prime minister in the world” by the German tabloid Bild, has been “caught” partying.
Marin's urine sample was tested for the presence of various drugs, such as cocaine, amphetamine, cannabis and opioids, Iida Vallin, a special adviser to the prime minister, told reporters.