The 20-year-old "Hannah Montana" star has been engaged to Hemsworth for past year now and the couple have been surrounded by split rumours since then, reported Daily mirror.
Cyrus has been spotted without her engagement ring, indicating she has parted ways with the actor.
Cyrus was also spotted with ex-flame Jonas earlier this year despite splitting with him after an 18-month relationship back in December 2007.
Jonas may have feelings for Cyrus since he dedicated his song 'Wedding Bell' to fellow singer and ex-girlfriend last year.