Liam Hemsworth and Miley Cyrus
09/14/2013 at 08:15 PM EDT
Has a wrecking ball hit their engagement?
In a troubling sign for an already volatile couple, Miley Cyrus
unfollowed her fiancé, Hunger Games
star Liam Hemsworth
, on Twitter on Saturday.
The singer, 20, has had a turbulent relationship with the Aussie actor, whom she met on the set of her 2010 movie The Last Song
Among the many recent reports of trouble: Hemsworth wasn't pleased about his her twerking performance
at the MTV Video Music Awards.
Still, Hemsworth continues to follow Cyrus on Twitter. Not so Cyrus – so far with no explanation.
The couple got engaged
in May 2012, but decided earlier this year to postpone their wedding
Cyrus was subsequently seen out without her 3.5-carat Neil Lane engagement ring but soon it was back on her hand and the couple were reunited
in July in Canada, where Hemsworth, 23, was shooting his new movie Cut Bank
Hemsworth was reportedly in Las Vegas on Saturday night for the Floyd Mayweather vs. Canelo Alvarez boxing match – and is still following Cyrus in Twitter – while Cyrus has been traveling to build buzz – and controversy – for her upcoming album Bangerz
out next month.
Her naked video
for her new song, "Wrecking Ball" has racked up more than 90 million views on YouTube.