who sang her hit “Firework,” John Legend, and Justin Timberlake.Twitter contentView on TwitterInstagram contentView on InstagramInstagram contentView on InstagramLet us slide into your DMs.Sign up for theTeen Voguedaily emailWant more fromTeen Vogue? Check this out: Another viewer was wondering whether Selena's backing track was simply too loud and overpowered her vocals. You started playing guitar at a really young age. What made you decide to pick up that instrument?R: Though the 2021 inauguration was a bit unique in regards to social distancing requirements, a bevy of stars joined Demi in celebration, includingKaty Perry,