Britney Spears' conservatorship is an "unusual case," lawyer says. Here's why.

Britney Spears broke her silence on the conservatorship she has been living under since 2008 at a hearing on Wednesday. Among the pop star's explosive claims are that she was stopped from removing a birth control device, not allowed to marry and forced to take strong drugs when she was unwilling to perform.

In an interview with CBSN on Thursday, lawyer Seth Berenzweig described Spears' conservatorship case as "unusual." "Over the personal life, it is extremely rare for something like that to apply to a grown adult," the sports, media and entertainment lawyer said. "Britney Spears is about to turn 40. This has been a conservatorship that has been in effect for about 13 years. So, it is very unusual in this kind of circumstance for this kind of a court-appointed process to apply."