Twitter quitter Miley Cyrus committed the ultimate etiquette faux pas while out to dinner last week — she failed to tip the waiter!  The Hannah Montana star — who took home a whopping $25 million last year — spent $70 on food for herself and her sister Brandi at the Outback Steakhouse in New York but didn’t leave any gratuity. “She pulled an envelope of money out and handed a $100 note over – but she kept all the change,” a source said.

Miley’s spokesman has since insisted the 16-year-old singer/actress had made a genuine mistake in failing to add a service charge. “Miley didn’t know she was supposed to tip unless she was eating inside,” the spokesman said.