It appears that Kristen Stewart's mood might have been abruptly changing lately, which creates some speculation on what exactly could be causing it, whether it's her ex Robert Pattinson or something else.

Kristen Stewart Enjoying Life Without Robert Pattinson?

On Saturday, Xpose Entertainment mentioned that the actress is on a detox regime, which requires a lot of green juice. This diet may have a lot of health benefits, but it might also be putting the actress in a not-so-happy mood while she's filming her latest movie Still Alice.

"Kristen isn't a friendly person on movie sets to begin with, but she is extremely feisty lately due to her green juice diet," a source supposedly told The National Enquirer via Xpose Entertainment. "The other day she yelled at one of the crew for eating normal food in front of her!"

Kristen Stewart Poses For Chanel

Considering The National Enquirer is a tabloid known for stretching the truth, there is a good chance that this information could be a trick. Yet it still begs the question if Stewart has been going through any sort of "feisty" time, is it really from her diet or from her ex Robert Pattinson?

There was a recent rumor that Stewart could have been pregnant from Pattinson's child, but a friend of the actress's reportedly made it clear that that was not true.

"Kristen is absolutely not pregnant," the friend told Hollywood Life. "She has put on a few extra pounds for a movie role and that's it. She's already so thin so a few more pounds makes a noticeable difference, she's still thin."

Tags: Kristen Stewart Robert Pattinson