This weekend Olivia Rodrigo will be doing double duty as host and musical guest on SNL . Taking a break from rehearsals at Rockefeller Center, she sat down with Jimmy Fallon on last night's Tonight Show to talk about the upcoming show, along with the major week she's had so far: She announced a massive tour and made history as the first artist to debut the lead singles from her first three albums at #1 when "Drop Dead" became the fourth #1 hit of her career. Rodrigo talked with Fallon about her upcoming album you seem pretty sad for a girl so in love and her favorite sad love songs — "Love Song" by the Cure or "Video Games" by Lana Del Rey. She shared that some songs from the new album are inspired by the relationship between legendary TV couple Miranda and Steve from Sex And The City . Rodrigo also shared a very cute story that happened to her earlier that morning.…