The 17-year-old New Zealander’s parents Sonja Yelich and Vic O’Connor are now engaged after a proposal at Niagara Falls.
“BEST DAY – went to niagra falls (sic) – my dad proposed to my mum after almost 30 years together,” she said on Tuesday in an emoji-laden tweet.
“Inevitable response yes i know i have seen a diamond now.”
Lorde – whose real name is Ella Yelich-O’Connor – became famous for her hit song Royals which includes the lyric: “I’ve never seen a diamond in the flesh.”
She had been in Toronto, Canada to perform at the MuchMusic Video Awards on Monday (local time) where she won international video of the year.
Ms Yelich and Mr O’Connor have four children together, including their superstar daughter.