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The couple, who announced their split last month after about a year together, were photographed kissing each other in her Mercedes Benz in Los Angeles on Monday morning.
Cyrus and Hemsworth were also seen visiting a bread shop and cafe together at the weekend.
A friend of the couple told Us Magazine: "She got back from Paris and they reunited."
Since their split, Cyrus has been romantically linked to her LOL co-star Douglas Booth, but sources say that they are "just friends".
