Right before Cyrus took to the stage to perform her breakup song, "Slide Away," she was walking next to Carter with the cameras following them.
Cyrus, 26, was wearing a black dress and Carter, 30, had on jeans and a baggy grey top.
As the new couple walked past the MTV camera Carter put her arm around Cyrus and Cyrus then put her arm around Carter.
The two women went through recent breakups and have been hot and heavy in public with each other since they were spotted kissing in Italy on Aug. 9.
The PDA on camera was a new level of romance for the gals.
Carter and her husband, The Hills star Brody Jenner, called it quits after it was revealed that they were never legally married.
Carter was by Cyrus’ side at the MTV VMAs, attending her rehearsal earlier in the day, as US reported.
Cyrus’ new song lyrics seemed to reveal details about her breakup.
“Once upon a time, it was made for us / Woke up one day, it had turned to dust. Baby, we were found, but now we’re lost / So it’s time to let it go.”
Scroll through the gallery to see the video of Cyrus and Carter’s loving moment at the MTV VMAs.
Hot Girl Summer
Cyrus and Carter got frisky backstage at the MTV VMAs.
Cyrus sang her new breakup song, "Slide Away," at the VMAs while Carter watched from backstage.
The couple were kissing passionately in Italy on vacation in early August.
The hot new couple were affectionate at the anticipated award show.
The two have been spending more and more time together since they were first spotted making out in Italy.
Fans know Cyrus denied reports she cheated on Hemsworth, telling her followers on Twitter "I'm not a liar."