Rihanna may be one of the world's biggest pop stars capable of drawing tens of thousands of punters to see her live show...but her karaoke skills certainly leave something to be desired.

According to the Mirror, after a recent show in Cologne the 25-year-old singer visited the Thai Royal Bar and she and a pal proceeded to take over the club's karaoke system for an impromptu performance.

She's probably wishing that there wasn't a couple of people there shooting the entire episode on their phones, though...

Click here to see the video in question.