What singer with #1 hit played role in movie of another singer with a #1 hit?!

Question: Jennifer Lopez was a recording artist who played the role of Selena in the movie. But Selena never had a # 1 hit.
I know of at least one female singer with a #1 hit who played the role in a movie about another female singer with a #1 hit.
Can you name both singers and the names of their #1 hits?

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Answers: Jennifer Lopez was a recording artist who played the role of Selena in the movie. But Selena never had a # 1 hit.
I know of at least one female singer with a #1 hit who played the role in a movie about another female singer with a #1 hit.
Can you name both singers and the names of their #1 hits?

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Diana Ross played Billie Holiday in Lady Sings The Blues

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