Sanna Marin and Markus Raikkonen pose for photos after their wedding, at the PM's official residence Kesaranta in Helsinki, Finland, on Sunday. AP

Sanna Marin, 34, said on her Instagram account that she married Markus Raikkonen on Saturday and posted a picture of the couple in their wedding outfits with a bunch of white flowers.

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.

Marin and Raikkonen have been together for 16 years and have a 2 1/2-year-old daughter, the government said.

Sanna Marin and Markus Raikkonen on their wedding day and (R) with their daughter. AP / Instagram photo

Marin, a Social Democrat who has been a prolific user of social media and a keen advocate for environmental issues, became world’s youngest prime minister in December.

At the time, she was the world's youngest serving head of government — a distinction she lost a few weeks later with the return to power of Austrian Chancellor Sebastian Kurz, who turns 34 later this month.

Associated Press