Jessica envies sis' perfect assets!

The pop star Jessica Simpson she has no idea how she manages to remain toned despite being so fond of sweets.

Pop star Jessica Simpson envies sister Ashlee's perfectly shaped body, insisting she has no idea how she manages to remain toned despite being so fond of sweets.

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"Her body is so sick (hot) right now! She's like this little surf girl with the most perfect boobs and the skinniest legs," Contactmusic quoted the 25 year old, as saying.

"I have no idea how she looks so good. She's addicted to sugar!" Jessica added.

But, even though she admires her sister's svelte figure, Jessica claims there exists no sibling rivalry between the two as they have vastly different body types.