Final answer:
The actor who learned dance from Jennifer Lopez is Kerry Washington and she used those skills in 'Save the Last Dance,' but less so in 'Django Unchained' and 'Little Fires Everywhere.'
Step-by-step explanation:
The actor who said that Jennifer Lopez substitute-taught her dance classes as a child is Kerry Washington. In an interview, Kerry Washington mentioned that she took dance classes from Jennifer Lopez when she was younger. This experience helped her develop the skills needed for her roles in 'Save the Last Dance.'
However, Kerry Washington called on her dance training less for her roles in 'Django Unchained' and 'Little Fires Everywhere.' These roles required different skills and did not heavily feature dance.