Billie Eilish's Hit Me Hard And Soft Tour showcases her growth as a musician, with eye-popping visuals and haunting vocals that prove she's at the top of her game.

Madonna's 12-year-old twin daughters Stella and Estere proved they're growing up so fast while posing for a photo with Billie Eilish after attending her Oct. 17 concert in New York City.

"But literally," the "Birds of a Feather" singer captioned a photo of her bruise Kevin Mazur/Kevin Mazur/Getty; Billie Eilish/Instagram ... the Grammy winner posed for photos with the 66-year ...

The three attended Billie Eilish's concert at Madison ... The twins took photos alongside Eilish, with the three smiling for ...