Get ready for an epic case of nostalgia.

'90s girl groups SWV—Cheryl "Coko" Gamble, Tamara "Taj" George and Leanne "Lelee" Lyons—and Xscape—Kandi Burruss, Tameka "Tiny" Harris, LaTocha Scott-Bivens and Tamika Scott—are reuniting for a once-in-a-lifetime performance on Bravo's new six-part limited series SWV & Xscape: The Queens of R&B. But their music revival doesn't come without tons of behind-the-scenes drama, as Kandi teased exclusively to E! News.