The musician co-wrote and produced Sister Sledge’s hit album We Are Family along with Bernard Edwards.
He tweeted: ‘#RIPJoniSledge #WeAreFamily My heartfelt condolences to your family because they are my family too. We did something pretty amazing together.’
The band’s publicist Biff Warren confirmed Joni was found dead in her home by a friend in Phoenix, Arizona, on Friday.
A cause of death has not been established yet.
La Toya Jackson also paid tribute to the singer with the message: ‘So sorry to hear that Joni Sledge has passed, my condolences to her family, friends and love ones. #Sistersledge we are family! #RIP’
TV star Ru Paul posted a photo of a Sister Sledge playlist with the caption: ‘Sister Sledge Forever.’
Joni formed Sister Sledge in 1971 with her sisters Debbie, Kim and Kathy.
Their greatest hits included “He’s the Greatest Dancer”, “Lost in Music” and “Thinking Of You”.
In an interview with Culture Trip last year, Sister Sledge talked about how they missed the disco era.
They said: ‘You could wear what you wanted to wear, it was freedom! No culture, no colour, just all dance you know?’
The band posted a statement on their Facebook page over the weekend saying: ‘Yesterday, numbness fell upon our family. We are saddened to inform you that our dear sister, mother, aunt, niece and cousin, Joni passed away yesterday.
‘Please pray for us as we weep for this loss. We do know that she is now eternally with Our Lord.
‘We thank you in advance for allowing us the privacy to mourn quietly as a family. We miss her and hurt for her presence, her radiance, and the sincerity with which she loved & embraced life.’
Sledge is survived by an adult son.