Jerry Yelich-O'Connor and her little sister Lorde celebrate Yelich-O'Connor's graduation.

Singer Lorde turned down Anna Wintour and a host of stars for a far more pressing engagement on Wednesday: Her sister's graduation.

In a video posted to the Instagram account belonging to Sonja Yelich, Lorde's mother, the singer is seen hoisting her sister Jerry aloft and laughing.

"Sooooo proud! @jerryflorence graduated today from the University of Auckland with a BCom & BArts conjoint," Yelich captioned the video. "Me n @lordemusic (sic) flew back from the US just for this day. So good to share it with u Jerry. We are all so proud of u

And Senior Scholar Of Arts."

Lorde, real name Ella Yelich-O'Connor, skipped Wednesday's star studded Met Gala, hosted by Vogue editor Anna Wintour, to fly back to New Zealand and attend the graduation.

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Lorde has three siblings: Jerry, 23, India, 19, and Angelo, 16.

Lorde and her mother, Sonja were in the US following Lorde's performance at 2017's Coachella festival. Lorde is currently promoting her forthcoming second album, Melodrama.