Britney Spears' father Jamie is reportedly going to extreme lengths to keep his daughter on the straight and narrow - including banning his daughter from seeing her new boyfriend Sandip Soparrkar.

While Britney reportedly feels trapped by her dad's regimented schedule, Jamie is said to be on a mission to prevent his daughter reverting to her previous troubled ways.

He apparently aimes to do this by keeping Sandip at arm's length and firing a chunk of Britney's entourage, including cleaners and cooking staff.

A source tells The People, "Jamie fears they might do the dirty on Britney. She's annoyed but Jamie is determined to do the right thing even if it isn't what she wants.

"She is very vulnerable at the moment."

The source adds, "Jamie is at his wits end over Britney's behaviour.

"He's decided he's got no option but to take total control over her life to stop her hitting rock bottom.

"He has fired Britney's cleaners, cook and childminders at her LA home."

See Britney through the years below