Swift wrote in her Instagram announcement Monday that she is supporting Tennessee's Democratic Senate candidate Phil Bredesen, who is running against Republican Marsha Blackburn for Sen.
Below, check out photos from the 2018 American Music Awards red carpet.
Swift will open the AMAs with her "Reputation" track "I Did Something Bad", marking her first awards show performance since 2016, when she sang "1989" hit "Out of the Woods" at that year's Grammys. "Get out and vote", Swift said when accepting her trophy.
Cardi B's collaboration with Bruno Mars, the remix of "Finesse", earned two nominations and she also earned nods for favorite social artist and favorite music video, among others.
Among the performances, a tribute to the late Aretha Franklin is planned.
Cardi B brought the party to the AMAs. In the rap/hip-hop and pop/rock categories, Drake is up for favorite male artist, favorite album and favorite song with "God's Plan".
Some of music's top stars, including Drake, Ed Sheeran, Beyonce, Ariana Grande, Rihanna and Kanye West, were absent on Tuesday.
Host Tracee Ellis Ross sported a white T-shirt for part of the evening saying "I am a voter", and presenter Billy Eichner, best known for the TV comedy "Parks and Recreation", urged the youth audience to register to vote.