The 29-year-old singer was performing a duet with her collaborator Bennett when she took a tumble in front of the crowd at Salle des Etoiles, reported Ace Showbiz.
In a video taken during the show, Gaga's seen rocking a long gown while singing "Anything Goes" alongside Bennett. She was walking on the stage when she tripped over the train of her dress and fell on her knees.
Fortunately, she did not seem to be badly injured. She quickly got straight back up and continued the song as if nothing had happened.
The tour will be brought back to North America later this month before being wrapped up in early August.