The “Slide Away” singer went to Las Vegas on Saturday, September 21, to perform at the iHeartRadio Music Festival.
Wearing a wild bondage-style costume, Cyrus worked hard, giving her fans a fierce performance.
While her mom Tish and sister Brandi cheered her on in Vegas, Carter was conspicuously missing.
And as Us Weekly confirmed, Cyrus, 26, and Carter, 31, had broken up.
Cyrus gyrated onstage while via Instagram, Carter showed her followers that she was staying at home in L.A. and relaxing on her couch!
A source also told PEOPLE, “Miley and Kaitlynn broke up. They’re still friends.”
“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,” the insider added.
Cyrus' same sex fling stunned followers of Cyrus and her actor husband Liam Hemsworth.
Their tumultuous marriage officially ended with Hemsworth filing for divorce in August . They had been married for just eight months.
Then Cyrus flaunted her blonde The Hills: New Beginnings star galpal, as they made out while on vacation in Italy, lunched with her mom Tish, looked close on a date to the VMAs, and shopped in Studio City just days before the split.
If body language was any indication, the "We Can't Stop" singer seemed happy with Carter after her marriage flopped.
RadarOnline.com had confirmed Cyrus and Hemsworth's breakup on August 10, and a source exclusively said, she “was the one to end it. She said she wanted an open relationship. She wasn’t ready for just one person forever.”
The source also explained that the actor, 29, wanted kids right away, while wild child Cyrus simply didn't want to be a mom.
“He wanted babies, and she just didn’t anymore,” the source said.
The sexually fluid Cyrus moved on with Carter and had a very public pow wow with Tish, who gave the couple her blessing.
For her part, Carter was in a high-profile previous relationship with reality TV's Brody Jenner.
However, they said their goodbyes in August. Although Carter and Jenner has taken part in an overseas "wedding" ceremony, it was later discovered that they were never legally married.
Cyrus appears to have shaken off her latest breakup by rocking the night away.
Scroll through Radar's gallery for more.
She Can’t Stop
Cyrus loves to be in front of an audience and wasn't going to let fans down even after her split from Carter.
Photos showed Cyrus giving it her all at the IHeartRadio event.
Cyrus' famous tongue no longer belongs to Carter.
The singer wore a leather wrap-around halter top and matching pants.
Not long ago, Cyrus was kissing Carter in Italy. But now she's unattached again.
Cyrus looked every inch a bachelorette on Saturday night after her husband Hemsworth filed for divorce in August.
Party In The USA
The star looked better than ever post-split.
Cyrus didn't perform a full concert but several songs on the IHeart lineup that featured various musical acts.
At the iHeartRadio Music Festival, Cyrus sang "Slide Away" and "Wrecking Ball," which are both believed to be about her relationship with Hemsworth.
Cyrus also performed "We Can't Stop," Led Zeppelin's "Black Dog" and Pink Floyd's "Comfortably Numb."
During the event, Cyrus' mother and frequent wing woman Tish was spotted dancing in the audience to '80s rock band Def Leppard.
I’m With The Band
Cyrus hung out with Def Leppard members backstage.
The star didn't have Carter, but plenty of other company at IHeart. After her show, Cyrus, Tish, sister Brandi and pals such as The Bachelorette's Kaitlyn Bristowe and boyfriend Jason Tartick, and Bachelor in Paradise's Derek Peth dined at the Hakkasan restaurant in the MGM Grand Hotel & Casino.
Cyrus must have worked up an appetite while performing, but she reportedly ordered a healthy dish of vegan rice at Hakkasan restaurant after the show.
Always full of surprises, Cyrus is single for the moment.