Rita Ora is allegedly hoping to get to the bottom of how police were alerted to her secret party over the weekend.
The popstar issued an apology on social media after it emerged that she had thrown herself a 30th birthday with around 30 friends at a West London restaurant on Saturday night in a breach of current coronavirus rules.
Police attended the venue and have since spoken to Ora about her actions, and according to The Sun, she is now determined to find out how they knew about the private gathering in the first place.
"Rita's transgression coming to light has left her humiliated, not to mention potentially out of pocket, as she's agreed to pay a £10,000 fine once it's issued," a source told the newspaper.
"Some of her closest confidantes have been getting in her ear suggesting someone on the guest list with a guilty conscience or a scorned friend who didn't make the cut may have dobbed her in.
"It was meant to be secret, but the fact police and photographers knew it was happening has really made Rita paranoid."
Ora is thought to have pulled out of a planned appearance on an upcoming episode of The Jonathan Ross Show following the incident.