Pop babe Christina Aguilera reportedly stormed out of a restaurant after staff challenged her meagre $12 (€9.80) tip.
The Dirrty star sat down for a $400 (€326.10) meal with pals at an exclusive Miami, Florida, hotel, but when waiters informed her gratuity failed to cover the 15 per cent service charge, she walked out in a rage.
A source tells Britain's Daily Star newspaper: "Workers were complaining that they would have expected more from her."