Ashlee's Got Jessica's Back

Jessica Simpson's sister has a big beef with everyone who is calling Jess ... big.

The littler Simpson, Ashlee, writes on her blog she is "completely disgusted" by all the attention her sister got from those photos of her in high-waisted jeans and a big belt. Slams Ash: "Is this something you would say to your wife, daughter, mother, grandmother, or even a friend? I seriously doubt it."

Jessica's ex-trainer is also piping about the controversy, saying Jess is "healthy."