The actresses were preparing for an interview with MTV Australia when Margot's younger brother, Cameron Robbie, walked in.
He sat down in the chair with his interview cards ready as though everything was super normal and, naturally, Margot was over-the-top excited by the 'prank.' She was on the verge of tears, in fact.
Check out the cute interview below...
It turns out Cameron has actually nabbed a job as an entertainment reporter for the publication, so we'd say his first interview was a raging success.
He later shared an adorable photo with his sister and Elizabeth, writing in the caption: "A little Friday fun for me."
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This article originally appeared on InStyle.