WATCH: Brisbane flash mob marriage proposal

IT'S the marriage proposal sweeping social media.

Video posted on Facebook shows a woman caught in the middle of a flash mob in King George Square. Next thing her boyfriend appears. Then he gets down on one knee and asks for her hand in marriage.

The Courier Mail reports the proposal was four months of planning by 29-year-old Highgate Hill resident Sam Maccoll.

With the help of a Gold Coast dance troupe, musicians, balloon artist and secretive friends and family, the proposal was a great success.

And his now fiance, Nicole Morrow, who was on a weekend trip to Brisbane for a manicure said: "We'd talked about getting engaged before and he started planning a special holiday for next month, so I thought maybe he was going to ask me then. So I was so surprised by all this."

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