The 28-year-old 'Firework' hitmaker's grandmother wore a T-shirt emblazoned with the message "I've got the hots for Papa Smurf", reported E! Online.
"You know, if she requests it, with all of her incredible requests she might get Papa Smurf," said Perry.
The pair have a close relationship and Hudson jokingly told her granddaughter to "drop dead".
"Grandma and I, it's always been a love-hate relationship. Just always at each others' neck," Perry added.
This isn't the first time Perry has taken her granny to a showbiz event - the pair previously wore matching Armani Prive gowns at the Grammy Awards in 2011.
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