The 'Drunk in Love' hitmaker who was with good friend and Destiny's Child band mate Kelly Rowland stunned a group of girls in Miami on Tuesday night (02.01.14) when she heard them singing 'Party', a hit from her fourth studio album '4', at a karaoke bar.
The stars sang and danced alongside the girls who initially didn't recognise them and the singers even photobombed one of the party girls who had passed out after a "five-hour drinking and singing session".
Karaoke boss Kellie Pilicer told the Daily Mirror newspaper: "There's no way we could have planned it, no one had any idea.
"They [the girls] didn't immediately recognise who either of them were.
"They started dancing together but still had no idea who it is. All of a sudden one of the girls looks at Kelly and says. 'Oh, you look like Kelly Rowland' and then looks at Beyoncé and goes 'Oh my god!' "
Meanwhile Beyonce's husband, rapper Jay Z, chilled out in a VIP room where he asked for security cameras to be taped up for his privacy and enjoyed chips from a takeaway shop next door.