Two children under the age of 14 have left judges "speechless" on Britain's Got Talent as the show got underway on Saturday night.

Harry, 11, and Lilliana, 13, wowed BGT judges Simon Cowell, Amanda Holden, Bruno Tonioli and Alesha Dixon with their individual auditions, both getting four yeses.

Lillana performed a "powerhouse" dance routine which brought the judges and the crowd to their feet. 

Dixon said: "Technically, I haven't seen anything like that for a long, long time. I'm speechless."

While Cowell added: "If I had to score that, it would be a 10."

Young Harry "rocked out" on BGT with a golden guitar, showing off some impressive skills.

At one point he stood directly in front of the judge's table and played the guitar behind his back. 

Social media erupted following his performance on BGT. 

On Twitter, one person said: "That little boy can play the guitar, he’s like a Little Rock star."

Another said: "WOW! Harry was full of confidence once he’d started. He was brilliant. Well done, Harry."

Although some were a little more sceptical about his performance. 

One Twitter user said: "Yea but when he turned around he stopped playing but the guitar didn’t!"

While another added: "How much was he actually playing and how much was the backing track?"

The Royal British Legion Band, who performed in front of Queen Elizabeth II a few years ago, opened the show with a performance of Bruno Mars' Uptown Funk.

Their performance also received four yeses.