Jaysis, between surprising Christmas shoppers in Walmart, to letting it all hang out in her new Partition video, you can't step out the door lately without Beyonce bouncing out of nowhere.

Some randomers who were singing her song during karaoke are the latest unsuspecting sorts to be surprised by Beyonce.

Herself and Kelly Rowland stunned a group of girls in Miami on Tuesday night when she heard them singing Party, one of the many, many hits from her fourth studio album '4', at a karaoke bar.

They burst in and danced alongside the girls, who initially didn't recognise them. Then they set about photobombing one of the party girls who had passed out after a "five-hour drinking and singing session."

The boss of Sing Sing Miami, Kellie Pilicer, told the Daily Mirror: "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, Jay Z was in less sociable form, opting to chill out in a VIP room instead. Once there, he asked for security cameras to be taped up for his privacy while he horsed into some chips from a takeaway next door.