Miley Cyrus: Does This Ring Look Familiar?

Miley Cyrus dropped a clue things are not only back on with former fiance Liam Hemsworth ... they might be eyeing the altar.

Miley arrived at JFK Sunday wearing what looks very much like the engagement ring she got from Liam back in the day.

The two split in 2013, but they've been hanging out lately and it looks like it's back on ... possibly in a big way.