A former couple are keeping their vow to remain friends following their short-lived romance.

Miley Cyrus and Kaitlynn Carter have reportedly broken up, just weeks after going public with their relationship.

After revealing that they will keep their friendship, Carter sent Cyrus a supportive message on her Instagram when the singer posted a photo of herself on Instagram.

"VEGA$ #iheartradiofestival2019," Cyrus captioned, to which Carter commented; "GET IT!!!!!"

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Friendly exes: Kaitlynn Carter left a supportive comment on Miley Cyrus' Instagram photo on Sunday, following news of their split after one-month on Saturday evening. Photo / Getty Images
Friendly exes: Kaitlynn Carter left a supportive comment on Miley Cyrus' Instagram photo on Sunday, following news of their split after one-month on Saturday evening. Photo / Getty Images
Photo / Instagram
Photo / Instagram

Carter's comment comes after it was reported on Saturday that the couple had ended their relationship, just one month after it began.

"Miley and Kaitlynn broke up," the source said.

"They're still friends."

The source said the couple connected after Cyrus split with Liam Hemsworth after one year of marriage, and Carter broke up with her partner of six years, Brody Jenner.

"They've been friends forever and were there for each other when they were both getting separated, but they're just not in a romantic relationship anymore."

It comes just days after Carter "drooled" over braless photos of Cyrus at New York Fashion Week that were posted on Instagram.

Carter commented "dear god" along with a drooling emoji as Cyrus shared a flurry of sexy images from Tom Ford's show.

Miley Cyrus and Kaitlynn Carter have reportedly called it quits. Photo / Instagram
Miley Cyrus and Kaitlynn Carter have reportedly called it quits. Photo / Instagram

Cyrus and Carter first went public with their relationship in August, when pictures emerged online showing them kissing on a trip in Lake Como, Italy — one day after the Wrecking Ball singer announced her shock split with Hemsworth.

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Cyrus and Hemsworth married in December 2018, after dating on-and-off for 10 years.

Cyrus and Carter were spotted on a number of occasions during their short time together, including a particularly amorous display in which they were "basically having sex" at celebrity hangout Soho House in West Hollywood.

Carter recently posted a photo of her and Cyrus together to celebrate Carter's 31st birthday.

- additional reporting news.com.au