updated 08/12/2013 AT 10:00 AM ET
•originally published 08/12/2013 AT 11:15 AM ET
Talk about a couple of bathing beauties.
The Prometheus star opted for a red bikini and sunglasses, while Jackson preferred to frolic in a diaper as he played with a snorkel mask.
At the meal, she sipped red wine and dined on a selection of Roman staples including prosciutto and mozzarella, cacia e pepe and amatriciana pastas.
Later that evening, Theron and her friends switched to Champagne as the group sang “Happy Birthday” to her and ended their Italian feast with a cake topped with candles.