Harper Beckham was treated to a night out at Justin Bieber's concert in London on Friday, and while the 5-year-old is probably one of the pop star's youngest fans, it's likely she is also one of the singer's sweetest supporters.

According to Marie Claire, a short clip was shared on Instagram following the show at the O2 Arena and let's just say Harper has got the fangirl thing covered.

At Justin Bieber's Concert ???? #kissesfromthebeckhams

A video posted by HARPER SEVEN BECKHAM (@harper_beckham) on

With her arm in the air and a mobile phone in one hand, the tiny tot can be seen swaying along along to Bieber's ballad 'Life is Worth Living' just like any devoted Belieber. Naturally, she dressed up for the occasion too in a cute white dress.

The Daily Mail reports Harper was joined at the concert by her dad David and her older brothers Cruz and Brooklyn. Their latest group outing comes after a family visit to Madame Tussauds last week, when David pointed out a few of the most famous wax figures to his children.

Though in Harper's eyes, we can imagine there was only one waxwork she really wanted to see...