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In a case of he-said, she-said, Sharon Stone is alleged to have lost her temper on a recent flight from Kalispell, Montana to Salt Lake City, Utah.

A witness spilled to Styleist.com, “The flight attendant in Kalispell asked her to gate check her bag and Sharon refused and got into a huge fight with her. They eventually took the bag from her and she screamed at her assistant with her and made a scene during the entire flight.”

The source claimed that Stone was then met by Salt Lake City police and was detained, although it’s not know if the actress was actually arrested as a result of the incident.

As for Sharon’s side of the story, she claims that it was the stewardess who lost her temper and “screamed” at Stone twice about the luggage. A rep for the Salt Lake City Airport claims that the police were present as security at Stone’s behest.

Hmm, now this is quite impressive in-flight diva behavior, but Sharon’s got a way to go if she wants to impress us.

Gallery Info: Sharon Stone out with her sons, Laird and Quinn, and a mystery man in Beverly Hills.