Miley Cyrus' brother Braison is reportedly dating Patrick Schwarzenegger's sister.

The 'Wrecking Ball' hitmaker's younger sibling, 20 and Patrick's older sister Christina, 23, are thought to have been dating since December this year, reports gossip website TMZ.

Braison has also fuelled rumours by posting pictures of himself and a girl resembling the beauty on his Instagram account captioned with a heart.

Meanwhile, Miley, 22 and Patrick, 21, are said to have grown extremely close since becoming romantically involved in November.

Patrick - whose parents are Arnold Schwarzenegger and his estranged wife Maria Shriver - has been a long-time admirer of the controversial singer and previously admitted to having a crush on her back in 2011.

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

It was recently revealed that the couple are also planning on getting matching ''X-rated'' tattoos together.

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.

''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!''