Miley Cyrus Engaged To Liam Hemsworth?: Singer Sports Rock On Ring Finger (PHOTO)

Is Miley Cyrus engaged? If her accessory choice at Muhammad Ali's Celebrity Fight Night XIII event in Phoenix, Arizona is any indication, the 19-year-old may be making plans to walk down the aisle with boyfriend, Liam Hemsworth.

The singer was spotted posing with Hemsworth, 22, and later clutching a microphone with her left hand, outfitted with a sparkler on a very telling finger.

On Thursday, Cyrus tweeted a photo of the same ring with the caption, "I am soooo obsessed with @jennahipp nail foundations! It looks so chic and classic!"

Cyrus and "Hunger Games" actor Hemsworth began dating after filming their 2009 flick, "The Last Song."

Now with engagement rumors flying, this isn't the first time it has been reported that the pair are heading toward marriage.

“They’re still keeping it a big secret, but they’re seriously talking marriage,” an insider told OK! magazine last week. “Liam is crazy about her, though he hasn’t proposed formally yet.”

Although we don't know for sure, Cyrus' ring tweet seems to be a pretty "formal" indication that the couple has taken their relationship to the next level.