The 23-year-old is said to be on the verge of ending their relationship soon following the 20-year-old pop star's raunchy antics on stage at the recently held MTV Video Music Awards, reports a website.
A source told a magazine that Hemsworth is "just weeks away from calling it off permanently. He is over her and wants to make a clean break. No more back and forth."
Cyrus was seen twerking with her tongue out and flirting with singer Robin Thicke on the stage of the awards night held in New York August 25.