Margot Robbie was left in shock when her brother interviewed her about her new movie 'Peter Rabbit'.

The actress is promoting the movie in Australia, and was surprised when her sibling Cameron arrived to ask her questions for MTV Australia.

In the hilarious moment caught on camera, Margot was visibly shocked when she realised her younger brother would be interviewing her about her latest project.

Margot voices Flopsy in the film, and Cameron said that there are similarities between the "dim-witted" rabbit and his older sister, who just happens to be one of the biggest stars in the industry.