During BSB's rendition of I Want It That Way, Kevin Richardson came out on stage at the Staples Center and joined the boys, making the crowd go CRAYZAY!
As one of our favorite Perezcious readers wrote:
"Like a phoenix from the ashes arose Kevin Richardson from the head of the penis stage during the boys final performance of I Want It That Way. Literally, the place exploded!"
Watch the fab five in all their glory (above)!
And look at the gallery (below) for some EXCLUSIVE pics from the concert, including a pic with A.J. serenading a guy! Love it!!