13 of the Youngest "Saturday Night Live" Hosts of All Time

Eilish hosted "SNL" for the first time on Dec. 11 2021. She pulled double duty, also serving as the night's musical guest with help from her brother Finneas O'Connell. Their parents, Maggie Baird and Patrick O'Connell, also appeared in the episode. Much of the episode was Christmas-themed. Eilish — born Dec. 18, 2001 — was the first "SNL" host born in the 21st century.