Taylor Swift, Shawn Mendes, Celine Dion and more are joining Lady Gaga for her coronavirus benefit show.The trio of musical superstars will be joined by the likes of Jennifer Lopez, Camila Cabello, Alicia Keys and Sam Smith for the One World: Together at Home event this Saturday.Curated by Gaga, 33, it will be hosted by Stephen Colbert, Jimmy Kimmel and Jimmy Fallon.