Still donning her pink hair, which she dyed to commemorate her album A Star Is Born selling six million copies, she wore a sexy dusty pink slip dress with a thigh-high slit. Each of the bridesmaids wore different looks.
"Two of my best friends just got married. Time to party!" Gaga wrote in her Instagram story.
In another photo, she was with one of the other bridesmaids on the beach, holding a bouquet of pink and red flowers, including roses.
Gaga also shared a video later that night of herself, the bride and the other bridesmaids dancing on the bar to Usher’s Yeah!
Sarah and Lady Gaga have been friends for a long time. Sarah once described Gaga as “A true friend and my family”.