who did debbie allen play on a different world
A Different World Producer/director Debbie Allen is the real-life sister of Phylicia Rashad. Allen made one guest appearance on The Cosby Show, playing an aggressive aerobics instructor who helps Clair slim down for a special occasion. Allen appeared in later seasons in a recurring role as Whitley's psychiatrist. Dwayne and Whitley also visited the Huxtable home in an episode featuring the revelation that Denise had married and would not return to Hillman.