One Mega Millions player has plenty of dough to ring in the New Year after drawing the winning number. After three months without anyone winning the top prize, a ticket worth an estimated $1.22 billion was sold for the drawing Friday night.

The Powerball jackpot increased again after it remained unclaimed, but one lucky person won a couple million on Christmas.

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.