When you're as adored as Beyoncé Knowles, it must come as no surprise when fans get a little over-excited at your concerts.
But that's exactly what happened during her concert in Copenhagen last night - and the pop star was not amused.
In video footage, the Crazy In Love singer can be seen approaching her crowds at the edge of the stage to encourage them to sing along.
This seems to be a common part of her show - earlier this month she stumbled across former X Factor winner Joe McElderry looking up at her.
The wannabe singer revelled in his chance to sing with the super star.
But a punter in the Danish crowd last night was not so content with a sing-along.
Perhaps his voice wasn't up to scratch?
Either way, he somehow thought it appropriate to slap mum-of-one Bey on the bottom.
Not one to be messed with, the married 31-year-old immediately turned to face him, stopped singing and told him he could leave.
She said: "I will have you escorted out right now, alright?"
Bey is currently on her European tour and will return to London for a stadium gig in Twickenham on Saturday.
The Single Ladies songstress is headlining the Sound Of Change concert and the security is set to be ramped up following the incident in Denmark.
Her security team are also worried after Bey received a string of strange post from a man in the UK.
The obsessed fan is believed to have sent threatening letters to the singer after he was warned to stay away from her in 2011.
Beyoncé won an anti-harassment order against Bassey Essien from South West London after it was revealed he'd made claims she was an imposter posing as the star.
He also alleged she had in fact killed the real Beyoncé.
A source told The Sun: “Staff have been briefed on the situation and pictures of him have been passed round.
"They’ve been told to keep their eyes open and be extra vigilant.”
The source added: “Security has been increased on a few engagements now, especially for her UK promo.
“It is believed similar letters to the ones that Essien sent have been received.”