Adam Lambert was arrested Thursday morning after getting into a fight with his Finnish boyfriend outside a Helsinki gay bar.
The pair was kicked out of the club and continued fighting in the street until bystanders were able to break them up.
The two were questioned by police and spent several hours in jail following the brawl but were released Thursday afternoon. No further action is expected because there were no injuries, police officer Petri Juvonen said.
Lambert made light of the situation in a tweet, writing "Jetlag+Vodka=blackout. Us÷blackout=irrational confusion. jail+guilt+press=lesson learned. Sauli+Adam+hangover burgers= laughing bout it."
Koskinen, a Finnish reality star, later wrote on his blog, "Celebrities are people too and fame is not easy. Love is not always easy either, but it's forever."
The 29-year-old American singer has dated Koskinen, 26, since November 2010.