Many fans took to Twitter to write that Lady Gaga looks a little intoxicated in the footage, with visual clues such as her slightly flushed face and needing help to walk, giving the game away.
Others suggested that wearing sunglasses at night time may have been the cause of the fall, and they would have obstructed her vision.
In more Lady Gaga related news, the superstar showed off her new boyfriend Dan Horton earlier this month, after the A Star Is Born actress was linked to her then married co-star Bradley Cooper in a string of salacious reports.
Taking to her Instagram Story, the Oscar winner posted two videos of herself enjoying The Cure and The Pixies at the Pasadena Daydream Music Festival on Saturday night, which she took Dan - a monitor engineer - to has her date.
The 33-year-old was snapped dancing with her 37-year-old boyfriend by concert goers, who then shared the footage on Twitter.
"I love the Cure, felt my old self come alive tonight what a show," Gaga captioned her Instagram Story.
Later a fan snapped Gaga and Dan flirtatiously chatting at the bar, posting the pic on social media.
Lady Gaga was first linked to Dan back in July, just six months after her split from Christian Carino.