Miley Cyrus' brother dating Patrick Schwarzenegger's sister?

Miley Cyrus' younger brother Braison Cyrus, 20, is reportedly dating Patrick Schwarzenegger's older sister, Christina Schwarzenegger, 23.

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According to gossip website TMZ, Braison Cyrus, 20, started seeing Christina Schwarzenegger, 23, in December, just a month after Miley, 22, and Patrick, 21, started dating.

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Braison has also fuelled such speculation by posting pictures of him and a brunette beauty, who closely resembles Christina, hanging out together on his Instagram account.

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What's more, he added a heart emotion to the caption of both images.

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Miley and Patrick - whose parents are Arnold Schwarzenegger and his estranged wife Maria Shriver - have been getting on so well in the early stages of their relationship that they are set to get matching "X-rated" tattoos.

A source said earlier this month: "It's not a one way street, he's into her big time. Her wild side does not turn him off. It's to the point where he's getting wilder, he's expanding that side of him.

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"He's actually gone so far as to tell her that he wants them to get matching tattoos, below the belt, if you know what I mean. It's so X-rated and of course she's totally down for it!"

Patrick's fondness for Miley - whose parents are Billy Ray and Tish Cyrus - dates back to 2011 when he admitted he was single and liked the 'Wrecking Ball' hitmaker.

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He said: "My eye, though, is set on Miley."

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