Britain's supermarkets enjoyed a record festive period, as shoppers splashed out to fuel the fastest growth since June 2014, according to market research group Kantar Worldpanel.
Sales were overall up by 1.8 per cent, but Aldi and Lidl saw far higher growth of 11.8 per cent and 7.5 per cent respectively.
The discounters also saw their market share notch up, with Aldi now at six per cent and Lidl at 4.4 per cent.
Among Britain's supermarket giants, Tesco led with a sales increased of 1.3 per cent, thanks to its performance within fresh food - its market share now sits at 28.2 per cent, Kantar's data showed.
Morrisons sales were in growth for the first time since June 2015 at 1.2 per cent.
Sainsbury's registered a sales decline of 0.1 per cent, but Asda had a far more difficult period - down by 2.4 per cent.
Fraser McKevitt, head of retail and consumer insight, said: “This year sales growth for both Aldi and Lidl accelerated compared to pre-Christmas levels as shoppers continued to warm to their premium lines.
Waitrose saw sales jump by three per cent and Co-op by 2.4 per cent.
This morning Morrisons revealed that it had seen the best Christmas in seven years, in the first official update from the big four supermarkets.
Investors are now gearing up for bumper updates from the remaining three.
Morrisons and Tesco's share price today jumped up by four per cent today, helping to push the FTSE 100 to fresh record highs.
Sainsbury’s jumped by 1.8 per cent, ahead of an update tomorrow.
Investors are also keenly awaiting results from Marks and Spencer after a number of difficult years.
Michael Hewson, chief market analyst at CMC Markets UK, said: "The Christmas period is always a key time of year for retailers and how they fare can always be a decent bellwether to how they perform for the rest of the year.
"This week’s trading update could well surprise to the upside for Marks and Spencer given recent retail sales data which showed food sales did well in the lead-up to Christmas.
"A decent performance here along with evidence that the general merchandise division is starting to show signs of a turnaround may well be the catalyst to drive the share price higher and keep the heat off new CEO Steve Rowe.
"The big concern now is that this deflation premium, which has been achieved on the back of lower commodity prices and increased competition could be about to come to an end as a lower pound starts to drive up import costs."