That's some birthday present!
Deisi Ocampo, from Chicago, was given two Lottery cards worth $20 each.
Her dad wished her happy birthday and good luck – and later that day, his daughter become a millionaire.
Deisi told local news: "It turned out to be the best birthday present ever."
The lucky teen was presented with her winner's cheque in a special ceremony, and said she plans to use her winnings to 'buy a new house for my family and pursue my dream of completing my degree and becoming a nurse'.
She won her millions in a game called $100 Million Money Mania, which offers players the chance to win prizes from $100 to $100,000, or a $4,000,000 top prize.
Last year, 18-year-old Jane Park, from Edinburgh, scooped £22 million on the EuroMillions lottery game - but vowed to carry on living with her mum and dad.
And in 2002, 19-year-old bin man, Michael Carroll, from Swaffham in Norfolk, became known as the 'King of Chavs' after winning just under £10 million in 2002.
Now said to be living in Elgin, Scotland, and working in a shortbread factory, he is thought to have spent all of his winnings on bad investments, houses, partying, jewellery and gifts to family members.
Britain's youngest lottery winner, 16-year-old Callie Rogers, spent nearly all of her £1.9 million win on cosmetic surgery, drugs and partying. But everything turned out right in the end when she gave birth to twins in 2012.