Also missing are some of the uniforms Britney allegedly wears for kinky sex games and personal pictures of her sons, two-year-old Sean Preston, and one-year-old Jayden James, were also taken.
"Some people might have gone first for the cash and jewelry, but these guys went first for all Britney's personal stuff," an insider told the Daily Star.
"They seemed to know in the long run this will be worth far more to them, if they can sell it to the highest bidder.
"Britney is beside herself with worry - having your home broken into is bad enough for anybody, but when you're famous and you have had some pretty personal things taken, it's 10 times worse,' the source said.
The 25-year-old star discovered that her $6 million gated property had been burgled when she returned home from a night out at the five-star Peninsula Beverly Hills hotel at around 2am early Saturday morning.
However, this is not the first time the 'Toxic' star has been hit by a sex tape scandal.
Last week, a 26-year-old man claimed that he had recorded the singer having sex in Hawaii.
In 2006, a clip showing the 25-year-old performing a sex act on ex-husband Kevin Federline appeared.