CHRISTINA AGUILERA just upped her “Oink” factor and had eyes rolling at trendy Hollywood eatery Osteria Mozza!

Dining with pals, the superstar thrush ordered a raw meat carpaccio appetizer topped with arugula leaves – but the instant it was served, she picked up her knife and swiftly flipped the greens all over the white tablecloth.

Hog-guilera’s entourage ignored her swine-ish table manners, but diners nearby were visibly aghast – and eyes really popped when she suddenly snapped her fingers at a passing waiter, pointed to her mess, then made rude hand gestures indicating she wanted it cleaned up…NOW!

“The server cleaned it up immediately,” said My SpyWitness, “but Christina never uttered even a simple ‘thank you!’”