Prince Jackson and his girlfriend pigged out on cheap hamburgers this weekend.

The 16-year-old son of late pop singer Michael Jackson and his girlfriend Remi Alfalah - reportedly a Kuwaiti princess - are worth millions between them, but eschewed Los Angeles' fine dining restaurants to enjoy a simple meal at one of the city's Smashburger outlets.

A source told the New York Post newspaper: ''I couldn't believe it - there were these two bajillionaires having $5.29 burgers.''

The couple, who spend most of their free time in the upmarket areas of Los Angeles and are frequently spotted eating, shopping and strolling around Rodeo Drive, an area famed for its luxury goods stores, were joined with friends and an adult, who ''looked like'' Prince's mother, Debbie Rowe, ''but wasn't.''

Actress Greice Santo was also spotted at the burger joint and advised Prince and his friends to try the chain's SmashFries with rosemary, olive oil and garlic.

Prince and Remi met at the Buckley School, an exclusive private school in Sherman Oaks, California, where they are in eleventh grade.