Ashton & Natalie Team Up for 'Friends with Benefits'

Is that acting or is Natalie Portman really not happy with her co-star Ashton Kutcher on set? Pretty sure she's just in character for a scene the twosome shot on Tuesday in L.A. for Friends with Benefits, and we've got commend her skills — Nat looks really mad!

Natalie and Ashton have seemed like old chums on the set so far, hanging out in between takes and palling around.

OK! GALLERY: NATALIE PORTMAN FINDS FRIENDS WITH BENEFITS

In fact when Natalie isn't around, Ashton has trouble keeping his eyes open long enough to film!

OK! GALLERY: ASHTON KUTCHER LOOKS SLEEPY & SLUGGISH ON SET