Yes, Lea Lea is right on the money with her explanation of how Britney's hair was created.
I actually knew one of her celebrity hairstylists who told me Brit has very fine, very thin hair.
She's been wearing some form of fusion hair extensions since she first burst onto the music scene as a teen.
Britney also sometimes wears clip-in extensions in addition to the fusion extensions in order to get maximum fullness at the roots and throughout.
The blonde beauty also wears wigs at times. Britney has access to some of the best celeb hairstylists in the business.