James Franco (Getty Images)

While conducting a new Interview chat with Mila Kunis, James Franco indicated that another costar of his is something of a diva:

The movie is a comedy, but it's kind of an outrageous one, and this actress—I won't say who, but she had a smaller role in the film—walked off the movie in the middle of a scene. [...] It's not as if the scene wasn't in the script, though. In any case, I didn't see any of this go down, but I guess she basically went up to the directors, Seth [Rogen] and Evan [Goldberg], and said, "I don't think I can do this." She, by the way, didn't have to do anything crazy in the scene. But what was going on around her was, I guess, too extreme for her. So Seth was like, "Well, what can we do to fix it?" And she said, "There's nothing you can do to fix it. It's just everything."

The actress, per Mr. Franco, walked off the set; for her part, Ms. Kunis says "What?" then indicates she never would have walked off a set. Per IMDb, the movie directed by Seth Rogen and Evan Goldberg is The End of the World; the female costars with seemingly prominent parts (which is to say, not playing "Party Goer" or the like) are Emma Watson, Rihanna, and Mindy Kaling. Ms. Kaling has exposed all different parts of her sometimes-raunchy sense of humor in her memoir and the pilot for her upcoming sitcom; Rihanna is certainly a diva, but not one who seems to be frightened of the extreme. And so it is that James Franco let Interview readers know that Emma Watson is difficult to work with.