Lohan's guest arc is cut from six to four episodes

Lindsay Lohan's guest-starring stint on "Ugly Betty" has been trimmed from six episodes to four. Everyone seems to agree on that.

But as for the reasons why? Well, that's where the story gets interesting.

Depending on whom you ask, either Lohan was a diva on the set of the ABC series who clashed with the show's star, America Ferrera, or Ferrera was "mean" to Lohan and engineered the "Mean Girls" star's exit.

First, the pro-"Betty" side. "It was a mess," a "production source" tells the New York Post's Page Six. "Lindsay would show up every day with an entourage of people." The source also says Lohan's dressing room was in such poor shape that it had to be repainted.

The source also claims Lohan refused to be on set until after Ferrera was already there, and when they rehearsed a scene from Thursday's (Oct. 23) episode, titled "Granny Pants," in which Ferrera's Betty de-pantses Lohan's character, "she wasn't wearing any underwear."

Not so, claims a Lohan defender -- or, as Page Six quotes this person, "Bulls***!" Lohan was, in fact, wearing a G-string in the aforementioned scene, and didn't think Ferrera was going to pull her pants down in the rehearsal. "But she did," the "Lohan pal" says. "Lindsay was so embarrassed, she started crying."

As for the entourage claims, the friend says Lohan's "sober companion," assistant and manager were on set, along with girlfriend Samantha Ronson, and that her publicist showed up a handful of times too. The dressing room was also used by cast members of the FOX show " Fringe," "so maybe they messed it up."

Meanwhile, E! is saying that creative issues forced the issue, quoting a source saying that Lohan's interpretation of her character wasn't in line with "Betty's" tone.