Actress Tiffany Haddish revealed details about the bizarre incident in an interview with GQ, but left the culprit unnamed.
Two actresses have already had to deny being guilty following media speculation.
Now fans are using #WhoBitBeyonce to track down the person responsible.
Tiffany, who stars in Girls Trip, said she met Beyonce at a party in December last year.
"There was this actress there that's just, like, doing the mostest," she told GQ.