And she wasn't disappointed. Rocking some impressively synchronized dance steps, the group performed a cover of Bell Biv DeVoe's iconic song "Poison," and it only took a few seconds before Mel B declared, "They're like the Backstreet Boys!"
As the audition continued, Mel couldn't get enough of 5 Alive's stage presence, and the former Spice Girls star sang and danced along from her chair at the judges table.
The band -- decked out in thematically matching white outfits -- transitioned flawlessly into Ginuwine's raunchy dance track "Pony," which nearly pushed Mel over the edge.
While Heidi and Howie Mandel seemed to generally enjoy the performance, Simon Cowell looked decidedly less enthusiastic and, at times, downright bored. But fans will have to wait until the new episode airs to see if 5 Alive gets the love they need to move on in the competition.