SMART MONEY'S ON THE GUY IN THIS FIGHT:

Zeta Jones and Julia Roberts power struggle (Female First)

Catherine Zeta Jones and Julia Roberts allegedly came head to head in a bitter power struggle on the set of 'Ocean's 12'.

Sources claim the two A-list legends nearly came to blows over costumes, lighting and VIP treatment while on location in Italy. [...]

The source added: "During filming of the first movie Julia was always out partying with the boys and was the tomboy of the group."