The 50th anniversary celebration of “Saturday Night Live” is so big, it’s not even on Saturday.

“Who’s that girl?”.

Maisy Stella, 20, will be a familiar name to some, for her years on “Nashville” playing Daphne Conrad, for her viral video singing Robyn’s “Call Your Girlfriend” with her sister Lennon Stella, and for being someone Billie Eilish has said inspired her to sing.