McAdams, who played the o.g. Regina George in 2004's Mean Girls, introduced Reneé Rapp’s "Not My Fault" performance and portrayed her own doppelganger in a sketch with Jacob Elordi.
The pretaped musical sketch channeled the crunchy vibes of Lilith Fairs past, starring current and former women of SNL, longtime SNL writer Paula Pell, and Billie Eilish.