You already know who it is...Ms.Solange Knowles!
She recently shared her hair regimen with Garance Dore. (Below)... Looks like she keeps it simple!
"Carols Daughter Monoi oil shampoo and conditioner."
I also use raw shea butter every day and pure Argon oil when its really dry (so pure, it makes me smell like a basket of nuts)
Once a week I set up a time where I wash and deep condition and very carefully comb out my hair, always starting with the ends first.
Yesterday was that day, and so I literally popped in a dvd (My Week With Marilyn to be exact)…sectioned off my hair with clips, and combed.
I usually sit under a heat cap to penetrate the conditioner and when it’s all clean and rinsed, I twist it with two strands of hair into twists.
When I take them out, I shower again …not getting the hair wet, but letting the steam frizz my hair up a bit more.
Occasionally when I am tired of this lengthy regimen , I get braids or wear extensions in the same texture as my own hair to give myself a break"-Solange
Solange is looking better than her big sister these days I must say.