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Romeo Beckham and Kim Turnbull are officially through, TMZ has confirmed ... and, we'll have to wait and see if this opens up the door for Romeo to reconcile with his bro Brooklyn Beckham .

Sources close to Brooklyn and Nicola Peltz tell TMZ ... the two didn't know Romeo and Kim split because they haven't spoken to them in months. Our sources say they aren't shocked -- telling us the power couple saw this coming. Getty

We broke the story ... Romeo and Brooklyn stopped talking a few months ago when Romeo started dating Kim, because Brooklyn felt she wasn't in the relationship for the right reasons.

Our sources say parents David and Victoria trust Kim with their son, but Brooklyn didn't ... and, he and his wife, Nicola, didn't want to be at any family gat

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