The 23-year-old "We Can't Stop" hitmaker was all smiles as she stepped out with Hemsworth from a Japanese restaurant in Malibu, reported People.
Cyrus kept her clothing sober with a high hair bun and a bright blue patterned shirt and ripped jeans along with a sling bag across her chest.
The"Independence Day: Resurgence" star dressed casually in a grey T-shirt, navy blue hoodie and jeans.
The couple were engaged in May 2012, but called it off within a year before rekindling their romance earlier this year.