Taylor Swift wins big! BTS rocks out! ET is breaking down the biggest moments from the 2020 American Music Awards! Justin Bieber hit us with a self-reflective performance of ‘Lonely,’ and debuted his collab with Shawn Mendes. Megan Fox and Machine Gun Kelly made their red carpet debut. Megan Thee Stallion opened up to ET about wanting to impress all her devoted Hotties. The 2020 American Music Awards aired Sunday on ABC.