People have been urged to check their Lottery tickets after 25 prizes of £1 million were won on Friday night.
The Christmas Eve EuroMillions Millionaire Raffle will break the existing world record for the most millionaires in a single draw once more than 18 players have come forward, according to the National Lottery.
A Lottery spokesman said: "It is great that we have four claims staked already, even with people busy celebrating Christmas.
"We urge everyone to check their tickets."
More than 2,500 millionaires have been created by the National Lottery in the past 16 years and every week a UK ticket-holder is guaranteed a million-pound prize in the EuroMillions Millionaire Raffle.
The winning raffle numbers are: BFM398783, DGD159945, DGD719200, DGF818051,
DGF851397, DGG277361, DGG310516, DGJ075608, DGL850456, DGM623889, DGN148733,
DGQ683415, DGR032175, DGS561280, DGT361529, DGV087857, DGW119899, DGW375730,
DGW560374, DGW702339, DGX248398, DHB070846, DHB749651, DHF422620 and DHG263337.
The EuroMillions winning numbers are 46, 19, 42, 36, 38 and the Lucky Stars eight and two.