The singer joins a long and impressive list of previously announced performers, including Lady Gaga, The Weeknd, BTS and more.
Cyrus is set to deliver her debut TV performance of her new single, "Midnight Sky," which dropped on Friday, during her appearance at the event.
Cyrus -- who has a long and indelible history with the VMAs -- previously sang at last year's show, where she delivered a memorable performance of her emotional tune, "Slide Away." This will be her fifth time performing.
Set to be hosted by Keke Palmer, this year's show was initially slated to be held at the Barclays Center in Brooklyn, New York, but those plans changed due to the coronavirus pandemic. Instead, the show will be held at several outdoor locations.
"The 2020 VMAs will be held on Sunday, August 30th and pay homage to the incredible resiliency of New York with several outdoor performances around the City with limited or no audience, adhering to all state and city guidelines," MTV and Barclays Center spokespeople previously told ET in a statement. "In close consultation with state and local health officials, it became clear at this time that outdoor performances with limited or no audience would be more feasible and safer than an indoor event."
"The VMAs will highlight the boroughs in an exciting show and return to Barclays Center in 2021," the statement added. "MTV will continue to work closely with the Department of Health, state and local officials, the medical community, and key stakeholders to ensure the safety of all involved."
Fans can vote across 15 gender-neutral categories at VMA.MTV.com until Aug. 23, with voting for Best New Artist continuing into the show on Aug. 30.
This year's Video Music Awards will air Sunday, Aug. 30 on MTV.