SERENA WILLIAMS - VENUS AND SERENA GO ON FIVE-HOUR SPENDING SPREE

Tennis-playing sisters VENUS and SERENA WILLIAMS are such huge fans of shopping they recently spent five hours in just one clothing store.

The millionaire siblings made their way to Charleston, South Carolina's SAKS FIFTH AVENUE, where they picked up a huge amount of stylish merchandise.

LORI SAAD, the store's manager, says, "The dressing room was utter chaos. They had a teeny dog with them, and he just sat on the couch and watched."

Serena adds, "We spent like five hours in that store. At one point I looked at Venus and said, 'Uh, why are we still here?' And she held up a great top, and I said, 'Let me try it on!' She's like, 'It's not fun when I shop alone.' I agree."