Excerpt: Two former members of Britney Spears' inner circle are dishing on the pop star's comeback. And it's not all positive.

First up: Alli Sims, Spears' ex-assistant who got the boot in January soon after the singer's mental breakdown.

Sims, who was Britney's constant companion for months, expresses her distaste for the star's upcoming world tour to In Touch magazine - and she's laying the blame on the singer's parents.