The 26-year-old actress, who has worked with Delevingne, 24, in "Suicide Squad", said she is the most genuine person one can ever meet, reported Femalefirst.
"She is a rare gem in this world and I've just never met anyone like her.
"She is the most genuine person you can ever meet and there's nothing calculated about that girl. She's like a little comet just blasting her way through this world," Robbie said.
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