Kylie Jenner has only been 18 years old for a couple of hours, but she has already told her mother/manager Kris Jenner that she is ready to take full control of her fortune and career, according to RadarOnline.com.

"She hasn't even been 18 for a full day yet and is already acting like a terror by trying to call all the shots," a family insider tells Radar.

The barely legal Jenner already has an estimated net worth of just more than $5 million, according to Celebrity New Worth, owns a $2.7 million dollar home, several expensive cars and a wardrobe that can only be rivaled by her sisters. According to the source, that is not enough for the "Keeping Up with the Kardashians" star, and she wants control over everything.

The problem seems to be that Jenner does not trust her momager with her money. The young star is "demanding that Kris give her access to her entire fortune immediately," as well as an entire rundown of where all her money is.

"She has even been going behind Kris' back and asking her sisters how much money they get paid per episode for the show and how much money they each pay Kris for managerial fees. She says it's her money and she wants all of it now," the source says, according to the Hollywood Gossip.