Is Miley Cyrus engaged to Liam Hemsworth?

Miley Cyrus has fuelled rumours that she is engaged to boyfriend Liam Hemsworth after stepping out with what appeared to be a huge diamond ring on her finger.

The 19-year-old former 'Hannah Montana' star, who has been dating the Australian actor on-and-off since they starred together in the movie 'The Last Song', flashed the sparkler as she and Liam attended Muhammad Ali's Celebrity Fight Night XVVIII in Phoenix.

She also tweeted a picture of her hand on Thursday and in turn revealed a close-up of the ring in question.

"I am sooo obsessed with @jennahipp nail foundations!" she wrote as she showcased her perfectly manicured hand, complete with diamond ring, leaving followers wondering whether she may be headed up the aisle.

Miley and Liam, 22, who stars as Gale in smash-hit movie 'The Hunger Games' have been inseparable in recent months and have even adopted a dog together.

“We have a pretty supportive relationship,” Liam said during a radio interview on 'The Bert Show'. “We’re always supportive of each other’s careers and we both know how we feel about each other. We have a great support system.”

BY GRAZIA BERVA / STARLOUNGE