Liam Hemsworth — About Miley Cyrus’ Engagement Ring …

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First Miley Cyrus” engagement ring returned … now Liam Hemsworth is back — but whether their engagement is back on is the big question, and we posed it directly to Liam.

Hemsworth arrived at LAX last night after a THREE WEEK trip to Australia and the Philippines … sans Miley, and on the heels of rumors he and January Jones had a fling.

We asked Liam about everything from Miley”s disappearing and reappearing diamond ring … January Jones … and even the quality of gnar Down Under.

Check out the vid. We”ll just say this … something is definitely up. But what