Beyoncé and Kelly Rowland gave some fans the shock of their lives recently by walking in on their booth at a karaoke bar - whilst they were singing a Beyoncé song.

The two stars, along with Jay Z, turned up at a quiet Sing Song bar in Miami on Tuesday (January 7).

However, it has emerged that they heard some revellers singing along to Beyoncé's track 'Party'.

The '4' star and Rowland then walked in on the booth, with the drinkers not even initially realising who they were before clicking.

One party-goer was even left sleeping after having too many drinks - promoting Beyoncé and Rowland to photobomb her.

The bar's boss Kellie Pilicer said: "A big security-looking guy walked in and asked us what time we closed. I’m thinking he’s going to come in with a couple of other people. Then one woman comes up and asks me where the bathroom is and I look up and it’s freaking Beyoncé."

Speaking about their fan interaction, she continued: "There’s no way we could have planned it, no one had any idea. They 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!'."