The 'Motivation' hitmaker was in Destiny's Child with Michelle and Beyonce Knowles, and she admits people rarely acknowledge how hard it must have been for her to join the group - after two original members left - in 2000.
She said: "You know, I completely salute Michelle for joining. She came onto a moving train that was going 1,000 miles per hour. Nobody every gives her the credit she deserves."
While many girl groups have been the focus of rumours about cat-fights in the past, Kelly says Destiny's Child were never like that, and she continues to be close with her former bandmates.
She told Stylist magazine: "Listen, you can't preach about having female power, supporting each other and being a unit, if you're not one. I remember one of the first solo projects Beyonce did, I was sitting there the whole video shoot supporting her.
"To this day, I could wake up one morning and there's this long text message from Bey or Michelle."