The Lost in Translation star was shocked Saturday when she had the winning key that won the $2.2 million home at the posh Flamingo South Beach resort.
Johansson's new home has three bedrooms and three bathrooms and she intends to put it to good use.
Her representative tells the New York Daily News, "She won the lease, (but) we made a decision that day to donate it to a children's organization.
"Possibly Miami Children's Hospital, so visiting parents have a nice place to stay."
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