Loved-up Liam Hemsworth is headed to the altar with actress Gabriella Brooks , and RadarOnline.com can reveal his bitter ex-wife – Wrecking Ball singer Miley Cyrus – is seemingly trying to wreck his happiness by sniping he's a lousy lover, a cad and the marriage is doomed.

Sources said the 32-year-old Heart of Glass songbird hates her ex's guts and hasn't gotten over him – six years after they filed for divorce . Article continues below advertisement

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An insider said: "Even all these years later Miley is still hanging on to so much resentment.

"Looking back, she feels like Liam treated her terribly. And she was a

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