Gareth Cattermole/Getty Rita Ora
The British singer, who turned 30 on Thanksgiving, was one of 30 people that gathered at Casa Cruz restaurant in West London's Notting Hill neighborhood on Saturday to celebrate her birthday, according to photos published by The Sun.
According to BBC News, London's Metropolitan Police broke up the party following reports about a potential breach of COVID lockdown regulations.
Per the country's current COVID-19 lockdown, which began on Nov. 5 and is set to end on Dec. 2, all pubs and restaurants in the country are closed for takeout and delivery, and indoor gatherings can only take place with those in the same household.
Ora apologized for attending the bash on her Instagram Story on Monday, calling it "a serious and inexcusable error of judgment."
"Hello all, I attended a small gathering with some friends to celebrate my 30th birthday," the star wrote. "It was a spur of the moment decision made with the misguided view that we were coming out of lockdown and this would be OK..."
Ora continued, "I'm deeply sorry for breaking the rules and in turn understand that this puts people at risk. This was a serious and inexcusable error of judgment. Given the restrictions, I realize how irresponsible these actions were and I take full responsibility."
"I feel particularly embarrassed knowing first-hand how hard people have worked to combat this terrible illness and being fully aware of the sacrifices people and businesses have made to help keep us all safe," the star added. "Even though this won't make it right, I want to sincerely apologize."
Rita Ora/Instagram Rita Ora
A spokesperson for Prime Minister Boris Johnson said in a statement, "It's important that everybody in society sets an example by following the rules — that is for every member of the public including celebrities. Throughout the pandemic, we've been clear that it's vital for everyone to abide by the rules in order to suppress the virus and reduce the transmission but enforcement matter is for the police."
According to The Guardian, the owner of Casa Cruz is likely to be fined £10,000 by Kensington and Chelsea Council for the party.
Ora is also expected to be fined.
As information about the coronavirus pandemic rapidly changes, PEOPLE is committed to providing the most recent data in our coverage. Some of the information in this story may have changed after publication. For the latest on COVID-19, readers are encouraged to use online resources from CDC, WHO, and local public health departments. To help provide doctors and nurses on the front lines with life-saving medical resources, donate to Direct Relief here.