Selena Gomez is in her 20s, while her Only Murders In The Building co-stars Steve Martin and Martin Short are in their 70s. So, it’s fair to say there’s a generational gap between them when it comes to certain things. That includes music, as Gomez explained that she introduced the comedy legends to Cardi B and Megan Thee Stallion’s hit “WAP,” as well as some other non-PG rap songs.