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A representative for Miley Cyrus insists the teen star was joking when she told revelers at her birthday party last week that she's becoming a "stoner."

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The former "Hannah Montana" star celebrated turning 19 at a bash in Los Angeles, and pals presented her with a cake in the shape of pot-smoking reggae legend Bob Marley.

Cyrus, who was caught on film last year puffing on a bong, giggled, "You know you're a stoner when friends make you a Bob Marley cake -- you know you smoke way too much f-----' weed."

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But a rep for the singer/actress tells "Access Hollywood," "The cake was a joke and Miley was being sarcastic. It is being completely taken out of context."

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On Sunday, Cyrus' pal Kelly Osbourne, who was at the party, took to her Twitter page to tell fans Cyrus' comment was a joke.