The 43-year-old singer surprised the audience at the performance of the musical in London last week, when she joined the cast to sing the Spice Girls’ classic single.
The West End production of Andrew Lloyd Webber’s ‘School of Rock – The Musical’ is based on the 2003 film of the same title.
It features music from the movie, as well as new music written by Lloyd Webber with lyrics by Glenn Slater.
The adult West End cast of ‘School of Rock – The Musical’ is led by comedy star David Fynn as Dewey Finn and he is joined on stage at each performance by one of three teams of thirteen young performers who make up Dewey’s band.
Meanwhile, Mel recently insisted a Spice Girls reunion will only work if all five members are involved.
The singer decided not to reunite with her bandmates Mel B, Geri Horner and Emma Bunton after Victoria Beckham opted out and Mel believes it needs all five members to work.
Speaking on ITV’s ‘The Nightly Show’, she told Davina McCall: “That’s where I’m at right now, that’s where myself and Victoria are at.
“It’s not really doing the band justice to go out as a four-piece, whoever is missing, it doesn’t matter.”
For me, Spice Girls, it’s like a jigsaw puzzle.
“It’s different to other bands because you look at Take That and they are going out as a three-piece, and they are brilliant, I love the boys.
“But with the Spice Girls everything about us was the individuality and what that created together.”