Rihanna left stunned as fan steals the show with amazing performance at her concert

Rihanna was left shocked when a fan at her concert showed off his impressive vocals.

The pop superstar looked gobsmacked when she offered her microphone to a member of the audience during her show on Saturday, only for him to blow her away with his voice.

Obviously not expecting to come across someone so talented, Rihanna randomly passed the microphone to Terah Stewart while performing at the US Bank Arena in Cincinnati.

The star’s reaction said it all as she was left open-mouthed when Stewart sung a few lines of her hit Four Five Seconds.

Fans were quick to post videos of the moment on social media, with one person writing: “I'm really crying at her reaction lol!”

Stewart found himself inundated with tweets after his impromptu performance, embracing his 15 minutes of fame.

“Thanks for all the love! I appreciate it. I'll see if I can meet some of the many demands in my #menchins lol I'm truly humbled,” he wrote.

“My devices keep crashing because of all of the notifications! Thank you! I wish I could mention you each individually!

“Thank you all for the kind words and encouragement. It means more to me than you will ever know.”