A young couple from Nottingham scooped £45m in Tuesday's EuroMillions draw, Camelot confirmed on Thursday.
Cassey Carrington and Matt Topham, both 22 and from Stapleford in Nottingham, banked a staggering total of £45,160,170.50 after matching five numbers and two Lucky Stars in the draw.
Carrington said she set up her online account only last Friday because she was feeling lucky.
"The store where I work had won an incentive for delivering excellent sales. We had been presented with £10,000 which was shared between staff.
"After that I just felt like it was my lucky day and decided to get a EuroMillions ticket.
"I got home and set up an account online. The minimum you could put into the account was £5, so I did that and bought one EuroMillions ticket for Friday."
Carrington said she has only played the lottery about half a dozen times and put the win down to it being "my lucky day".
Gareth and Catherine Bull were the last big UK winners nearly three weeks ago when they banked £40,627,241 after matching the numbers from a Lucky Dip ticket on the EuroMillions draw on January 20.
The biggest EuroMillions prize was a £161m jackpot won by Colin and Chris Weir, from Largs, Scotland, last year, but this is the second big win in Nottinghamshire this year.
The latest winners matched five numbers and two lucky stars in Tuesday's draw.
A Camelot spokesman said: "It is fantastic news to have another UK winner so soon after Gareth and Catherine Bull from Mansfield won £40m.
"These big draws help raise the £30m the National Lottery generates for Good Causes every week."
Camelot said Friday's jackpot is an estimated £12m.Suggest a correction