"There are four different covers with different women and one of the covers is Cardi B," Gerwig said on “The Tonight Show Starring Jimmy Fallon.” "Cardi B is a huge inspiration to me."
Gerwig explained that she was directing the film while pregnant, which no one knew.
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“I would go home at night and watch Cardi B's Instagram videos about her pregnancy — and they were incredible," she said. "I was like, she's amazing! She's making music videos and complaining about things! She's, like, wonderful!"
Much like Gerwig, Cardi B, whose real name is Belcalis Marlenis Almanzar, did not slow down during her 2018 pregnancy. After confirming long-bubbling rumors that she was expecting during a performance on "Saturday Night Live" that April, the star continued performing. She rapped during energetic sets at both weekends of Coachella and was scheduled to join Bruno Mars on his "24K Magic" tour. However, her pregnancy led her to cancel some tour dates toward the end of April.