Two British ticketholders shared a massive £90 million jackpot in last night's Euromillions draw, Camelot said.
They scooped £45,570,835.50 each - the largest lottery prizes ever paid out in the UK.
A National Lottery spokeswoman said: "This is fantastic news. These two ticketholders have just banked the largest lottery prizes ever paid out in the country."
The spokeswoman added: "If either of the tickets belong to a single winner they will soar into the top spot on The National Lottery Rich List, trumping Glasgow postal worker Angela Kelly's £35.4m win in August 2007.
"We have plenty of champagne on ice and are looking forward to welcoming the lucky ticketholders to the National Lottery millionaires' club."
The winning numbers were 19, 43, 45, 34 and 11. The Lucky Star numbers were 5 and 9.
From next week every Euromillions ticket will include the Millionaire Raffle game, where every week one UK player will win £1 million.
This month The National Lottery is celebrating its 15th anniversary.
Since the launch more than 2,300 millionaires have been created and more than £23 billion raised for good causes.