Choreographer and dancer Bruno Tonioli, best known for his stints as a judge on “Dancing With the Stars” and “Strictly Come Dancing,” has replaced David Walliams on “Britain’s Got Talent,” according to a new video circulating on Twitter.

In the video, which appears to have been filmed by an audience member at the first round of auditions, “Bgt” hosts Anthony McPartlin and Declan Donnelly (better known by their collective stage name Ant and Dec) are introducing this year’s judging panel, which is made up of returning judges Simon Cowell, Amanda Holden, Alesha Dixon and Tonioli.

“Thank you very, very much,” Tonioli, clad in a sparkly red jacket, tells the applauding audience. “I am thrilled to be here. Look at these girls [Holden and Dixon], they’re stunning and it’s my old friend Simon. What an honor it is to work with you finally. He’s teased me with this for years,...