Just won millions in the lottery? Congratulations! Here's what to do — and more importantly, not to do — to avoid making some very big mistakes.

This holiday season, a lucky Mega Millions player might receive a $1.15 billion belated Christmas gift after no one won Tuesday’s jackpot.Friday’s grand prize has now soared to an estimated $1.15 billion – the largest prize ever offered in the month of December.

No one won the $1 billion Mega Millions jackpot in Tuesday’s drawing, but nine tickets sold in Florida still won a nice chunk of change.