[Saph]

claims that Britney acted odd backstage of her perfume ad and X Factor.

The X Factor’s wrapped up, but reports recently surfaced claiming Britney’s behavior behind-the-scenes was bizarre, reports the NYDailyNews.com.

“She acts like she has a different contract than everyone else,” said a source. “She shows up late, she wanders around aimlessly and she is in her own world. She wasn’t ready for this responsibility.”

Despite the source claiming Britney couldn’t handle the heat, homegirl managed to have an extremely stable and consistent season. Sure, Simon may have paid her the $15 million in hopes for an on-camera meltdown, but apparently she saved all the craziness for a smaller audience backstage.

This isn’t the first story of its kind. Last August, RadarOnline reported Britney became erratic on set during her commercial shoot for Fantasy Twist.

“Britney didn’t interact with the cast or crew at all during the two day shoot and she seemed to be just going through the motions when the camera was rolling, and seemed out of it,” the source said last summer.

The latest insider adds to the wackiness, telling NYDailyNews of that same fragrance shoot:
“First, she wanted the producers to fly Vanilla Ice in to duet with her, which was just weird. They called him and he wanted $500,000, so that wasn’t going to work,” says the source. “Then, she demanded that exotic animals be flown in to be in the video and they had to tell her that that wasn’t going to work for legal reasons and insurance reasons. She wanted to do her own makeup and when she would get it done, she would just mess it up on top of what they did.”

What held Britney together during the recent backstage dramas of The X Factor and Fantasy Twist is her fiance Jason Trawick.