Destiny's Child Reunite for Awesome Performance ... Yep, With Beyonce!!!

Destiny's Child was back in business Saturday night in Vegas for the Gospel Music Awards ... and we're talkin' Beyonce.

Actually the star was Michelle Williams, who picked up the award for Music Video of the Year for her song, "Say Yes." The song features Beyonce and Kelly Rowland, but they don't go by D.C.

The girls performed the song, and it's really great. The crowd loved it.