Mel B performed spectacularly at the Spice Girls' 30th anniversary concert in London.
Fans packed tightly into the O2 Arena.
Melanie C said the show was heart‑warming.
The night was overshadowed by a reported feud inside the group recently reported.
The dispute centres on leadership and royalties.
The event marks three decades since the group first burst onto the scene.
Later that day Mel B appeared as a temporary judge on America’s Got Talent.
A teenage singer took the stage and earned the judge’s golden buzzer right after the final note with applause.
The buzzer sent the act straight to the live shows.
Cowell pressed it instantly.
Mel B said the singer showed impressive confidence.