Britney Spears is said to be angry about spending less time with her sons following a change in her custody agreement.
Since September the Baby One More Time singer, 38, has had a 70-30 agreement with her ex husband Kevin Federline over their boys Sean, 14, and Jayden, 13.
The former couple had shared 50-50 custody since their divorce in 2007, but this changed following an alleged altercation between her dad Jamie Spears and Sean last August.
Kevin was granted a restraining order against Jamie, who has been Britney's conservator since 2008.
The conditions of the order prohibit Jamie from coming near his grandsons for three years.
The boys also can't be around Britney unless another adult, who cannot be Jamie, is present.
And it's claimed Britney is angry with her father because she sees her sons less.
A source told Us Weekly : "Britney hasn't been spending time with her dad, and very much remains angry that she doesn't have the boys as much as she did in the past.
"Jamie worries about her not having a set schedule for work that keeps her busy."
Mirror Online has contacted Britney's reps for comment.
It comes after Jayden publicly spoke out against his grandfather , calling him a "d**k".
During an Instagram Live post, Jayden read out and answered questions from fans, saying: "'How can we support your mom?' Well, I don't know. 'Cause like I'm trying to do stuff, but like they're all over me or whatever.
"'Is your grandpa a jerk?' Yeah, he's a pretty big d**k."
Britney hasn't had full control over her business and personal life ever since her public breakdown in 2008.
She was entered into a legally mandated conservatorship - also known as a legal guardianship - which means that her father Jamie has control of her financial affairs and daily life.
Her fans have started a #FreeBritney movement in a bid to free her from her father's control.
