The honours were accorded them for their achievements and influences in music. Also honoured with a doctorate was Grammy award-winning composer, Alex Lacamoire.
Excited Timberlake and Elliott took to Instagram to express their joy at becoming doctors.
In 2002, Elliott won a Grammy Award for Best Rap Solo Performance for “Get Ur Freak On”.
She received five Grammy nominations in 2005, which included one for Best Rap Album for The Cookbook(2005).
The 47-year-old is set to become the first female rapper to be inducted into the Songwriters Hall of Fame in June.