The Tonight Show Starring Jimmy Fallon Season 4 Episode 42 Leslie Mann, Jonathan Groff, Machine Gun Kelly, Camila Cabello

In the 42nd episode of the fourth season of The Tonight Show Starring Jimmy Fallon, host Jimmy Fallon welcomes four talented guests to the show. The first guest is Leslie Mann, an American actress known for her roles in films such as "The 40-Year-Old Virgin" and "This Is 40." Mann discusses her experience working with Robert De Niro on the new film "The Comedian" and her upcoming projects.

The second guest is Jonathan Groff, an American actor and singer who is best known for his work in musical theater and his roles in the television series "Looking" and on the Netflix show "Mindhunter." Groff discusses his experience playing King George III in the hit musical "Hamilton" and his current role on "Mindhunter."

Next up is Machine Gun Kelly, an American rapper and actor who has released several successful albums and starred in films such as "Project Power" and "The Dirt." Kelly talks about his new album "Tickets to My Downfall" and his upcoming projects in film and television.

The final guest is Camila Cabello, a Cuban-American singer and songwriter who first rose to fame as a member of the girl group Fifth Harmony and has since released several successful solo singles including "Havana" and "Señorita." Cabello discusses her new album "Romance" and performs her latest single on the show.

In addition to these interviews and performances, the episode also features Fallon's signature comedy sketches, including a "Thank You Notes" segment and a "Hashtags" bit. Overall, this episode is a fun and engaging hour of television for fans of late-night talk shows and pop culture.