No More Soon-To-Be Mrs. Miley Hemsworth?

Supposedly, couple Miley Cyrus and Liam Hemsworth broke off their engagement not too long ago. I don't believe anybody's too sure if they have broken it off or not. 
Miley hasn't been seen wearing her engagement ring until about four days ago (3/19/13) when she posted a picture on twitter in a unicorn onesie with her engagement ring, as seen above, right in front of everyone's eyes. 
On March sixth, there was a picture posted of Miley with a diamond ring on but not her engagement ring. Could this be an on-and-off-again relationship?