Worst Tipper #5: Madonna leaves bad tips all over the world.

There's been so many reports of Madonna's miserliness, it's almost like being stiffed by Madge is a rite of passage amongst high-end eatery wait staff.

While Madonna was still married to Guy Ritchie, the duo left $18 on a $400 ticket in a West London restaurant -- a 4.5 percent tip.

Another waitress reported that after Madonna ate with a pal at NYC hotspot Babbo, she failed to leave any tip at all.