Ashlee Simpson's jealous of Jessica Simpson's pregnancy
Ashlee Simpson can't help feeling envious
Jessica Simpson is pregnant with her second child
Peter Wentz and Ashlee Simpson's relationship fell apart
Jessica Simpson is now in love with Eric Johnson
But while she's all smiles on the surface, Now can reveal she's wracked with jealousy underneath.
A source says: 'She thinks Jess has everything while she's struggling.'
Ashlee split with husband Pete Wentz in February 2011 after three years of marriage.
Meanwhile, Jessica's pregnant with her second child just seven months after the birth of her daughter Maxwell.
Our source adds: 'Ashlee's pleased about her sister's news, but she always thought she'd be the one happily married with kids and Jess's pregnancy has re-enforced her feelings of failure.'
Read more about Jessica Simpson and Ashlee Simpson in Now magazine dated 20 December 2012 - out now!