The 36-year-old actress—who's providing the voice for Princess Fiona in the upcoming Shrek the Fourth, now filming—arrived at Los Angeles International Airport on Monday with a massive white bag.  She didn't mind toting the satchel by herself, no matter how much money she has to pay people for such trivial tasks.

Presumably, Diaz's current beau, 38-year-old British model Paul Sculfor, was too busy looking pretty somewhere to help his lady-love in her hour of need.

But more importantly, what could Diaz have been lugging in that gargantuan accessory?

Perhaps the answer lies in the Something About Mary star's goals for 2009. Diaz recently told the London Paper, "I have always had the same New Year resolutions: to stop smoking, to start wearing a bra and to stop shopping."

Given Diaz's heavy cigarette habit, it's pretty obvious that the bag probably contains a year's supply of Nicorette gum. And maybe a few supportive undergarments.