Never get between an Aussie and his blood bros.

Following a ton of drama and denials from Miley Cyrus, it appears she and Liam Hemsworth are totally dunzo -- and it looks like Liam's brother, 'Thor' actor Chris Hemsworth, played a role in the split.

Us Weekly reports that Chris and fellow Hemsworth brother Luke urged Liam to drop the ball on marrying Cyrus, with a source dishing, "They want him to end the romance for good."

Can't say we blame them -- how exhausting is it to hear about a pal's on-off relationships constantly? Picture that and multiply it by a million since you're hearing about this one in the press.

It looks like Liam is listening to his beefcake brother, too -- the couple hasn't made wedding plans, and even when they're in the same city, they haven't been together all that much.

The mag notes that on May 1, Cyrus hung out at Beacher's Madhouse while Liam lurked at Chateau Marmont. While one source (likely closer to Cyrus) swears they aren't finished, another warned, "Liam's pulling away."

But if you've heard all the rumors lately, that really shouldn't be much of a surprise.

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