Britney Spears has responded to her sister Jamie Lynn’s surprise withdrawal from “I’m A Celebrity… Get Me Out Of Here!”

“Britney is disappointed, but nothing surprises her anymore when it comes to her family’s unprofessional behaviour,” a person familiar with the matter told DailyMail.

Jamie announced her departure from the show on Wednesday, with show producers stating she departed on’medical grounds,’ just days after telling campmates she felt ’emotionally weak.’

Insiders close to Britney, 41, believe Jamie Lynn had no intention of staying on the show for more than 72 hours – the amount of time required to earn the huge salary.

“Jamie Lynn knew damn well going into this that all she had to do was last 72 hours and she was going to get paid. So that is what she did. She never intended on staying any longer than this. This was just a quick paycheck for her – same as the Special Forces was.”

Jamie previously sobbed after leaving Fox’s Special Forces: World’s Toughest Test after only two days.