Was It the Twerking? Cheating Rumors? Miley Cyrus & Liam Hemsworth Officially Split

After nearly four years together -- and one very rocky 2013 -- the singer and actor have ended their engagement

The yearlong question surrounding Miley Cyrus and Liam Hemsworth -- are they together or not? -- has finally been answered: The couple has officially split.

Reps for both Cyrus and Hemsworth have confirmed to People that the engagement is off. The couple had been together for nearly four years.

Sources tell E! that the split was "Miley's decision, after coming to grips with Liam being what she believed was less than faithful to her."

The news doesn't come as a shock to anyone. Following cheating rumors that began early this year, the couple has rarely been spotted together.

The Hunger Games actor has been linked to Mad Men actress January Jones since he left an Oscars afterparty with her in February. Last week, Us Weekly claimed that the pair have been "sexting" behind Cyrus' back, though Hemsworth's rep denied the allegations.

Another suspected cause of the split is Cyrus' raunchy Video Music Awards performance. Hemsworth was noticeably absent from the event, but the last straw may have come after the awards. Us Weekly reports that he wanted to "call it off permanently" with Cyrus because he found her VMAs performance "mortifying."

But this relationship was on the rocks way before the VMAs. The "Wrecking Ball" singer went without her 3.5-carat Neil Lane engagement ring earlier this summer, and wasn't seen wearing it until the couple reunited in July in Canada, where Hemsworth was shooting his new movie, Cut Blank. They made their first red carpet appearance together in months for his movie Paranoia on Aug. 8 in L.A.

Cyrus and Hemsworth met on the set of the 2010 film The Last Song and got engaged in May 2012.

At the time, the pop star told People, "I'm so happy to be engaged and look forward to a life of happiness with Liam."

The split comes just days after Cyrus unfollowed her ex-fiance on Twitter. And considering Cyrus is an active Twitter user, that may have said it all.

With Cyrus on a publicity blitz for her upcoming album Bangerz and Hemsworth preparing to promote Catching Fire, at least these two have a lot to keep them busy during this tough time.

Teresa Roca is an iVillage contributing writer. Follow her on Google+.

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