The `Fear` singer was horrified when police were called to Paradise in Kensal Green, north London, after a group of revellers objected to being asked to move to accommodate her, siblings Sarah and Alfie and mother Alison Owen because their table in a private dining room had been double booked.
A source told Britain`s Daily Mirror newspaper: "Lily and her family had all got to Paradise to have a nice meal for Sarah`s birthday but there seemed to have been a mix up with the rooms.
"The group that were in there were apparently quite rowdy and worse for wear.
"Lily and her family were trying to ask them to move but once they saw Lily they got really mouthy. There was some pushing and shoving as they refused to move and someone called police."
Police confirmed that two men aged 40 and another aged 43 were arrested on suspicion of affray on Sunday (06.12.09), with the older man also held on suspicion of assault.
A spokesperson said: "They had booked to have a meal in the private dining room. There must have been a mix up as there was already a group in there."