Also in attendance were Kirsten Dunst, 26, and Mary-Kate Olsen, 22, though they weren't exactly discussing art together, says Page Six.

An eyewitness tells the site that the pair got into a spat while sitting together at Audi's party at the Delano hotel in South Beach.

"They just kind of stared at each other for a long time and then started exchanging nasty words," says the source. "Then Olsen just got up and left. She's been going really late every night."

Oh, to be a fly on the wall for that argument. What could it have been about?

Another partygoer tells Page Six, "[Mary-Kate] looked like she had not brushed her hair in a week and she was chain-smoking the entire time and sitting like a sourpuss with her boyfriend. She was acting very oddly."

Dunst has had to endure several awkward situations recently. Last week reports surfaced that she was dating her collaborator on a political documentary, Jacob Soboroff.

Her rep swiftly insisted there is "no romantic involvement at all" between the two.

Dunst was also rewarded a temporary restraining order against Los Angeles native Christopher Smith, who has been allegedly stalking the actress.

A hearing is scheduled on December 22 to determine if Kirsten will receive a permanent restraining order against Smith.

Hopefully she will not need a secondary order against Mary-Kate Olsen.