Singer Lorde's parents have become engaged after 30 years together.

The hitmaker took to Twitter.com on Tuesday (17Jun14) to reveal her dad Vic O'Connor popped the question to her mum Sonja Yelich juring a trip to Niagara Falls.

She writes, "Best Day - went to niagara falls - my dad proposed to my mum after almost 30 years together."

And, poking fun at the opening line of her Royals hit, in which the teenager sings "I've never seen a diamond in the flesh", she adds, "inevitable response yes i know i have seen a diamond now".