Mega Millions jackpot jumps to $1.22 billion as ticket sales soar for Friday's drawing

The Mega Millions jackpot has jumped to $1.22 billion as ticket sales soar in advance of the Friday drawing. The jackpot has steadily grown following a $1 billion Christmas Eve drawing that didn't produce a winning jackpot ticket.

On Christmas Day, lottery officials said the estimated grand prize was a gargantuan $1.15 billion, with a cash option of $516.1 million, but that number has since expanded.

"Ticket sales are going through the roof," a spokesperson for Mega Millions told CBS News, adding that once a jackpot hits this level, there is often a corresponding increase in ticket sales.