<P> 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 . </P>
<P> 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 . </P>
who did debbie allen play on a different world
who did debbie allen play on a different world
Whitley 's psychiatrist
Whitley 's psychiatrist