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Jessica Simpson’s Ashlee anger

(BANG) - Jessica Simpson is reportedly jealous of younger sister Ashlee.

The ‘Employee of the Month’ actress is said to be unhappy her sibling’s fame is beginning to eclipse her own.

A source told Closer magazine: "Jessica finds it tough being compared with Ashlee, who’s becoming a big star and is threatening to overtake Jessica as the more successful sister.

"Jessica was always seen as the bigger star, but now Ashlee is taking over. There’s certainly a sibling rivalry between them."

Since she started dating Pete Wentz, Ashlee, 22, has become a regular on the Los Angeles party scene and can rarely step out without being followed by a throng of paparazzi.

Jessica, 26, stardom has somewhat waned since her divorce from ex-husband Nick Lachey " who she appeared with in hit MTV reality show ‘Newlyweds’ " while her last film ‘Employee of the Month’ received a lukewarm response from fans and critics.

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