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

It’s been a busy month for lottery players. The Mega Millions jackpot now stands at a $1.22 billion ahead of a Dec. 27 drawing, after a Christmas Eve drawing failed to yield a winner. That makes it the largest such prize for either of the two big multistate lottery games — Mega Millions and Powerball — in the holiday-filled month of December,

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.