Credit: Jamie McCarthy/Getty Images for QVC

Jessica Simpson is coming to her family's defense once again.

The 29-year-old singer -- who called Melrose Place "crap" after her younger sister Ashlee was canned -- is now going after celeb blogger Perez Hilton, who poked fun at her nephew Bronx.

On Friday -- Bronx's first birthday -- Perez wrote: "It's been one year since Asslee pushed Bronx Mowgli through her vayjayjay and it's all the family is talking about!"

He then ended his post by calling Bronx a "poor lil' thing" who "doesn't stand a chance!!!"

Simpson wasn't amused. She Twittered later that day: "Does perez hilton..whatever his name really is..have no heart at all?Don't ever attack my family again.Sad to know u hate so deeply.Sad 4 U"

Her spirits seemed to improve a short time later. "I challenge everyone to save up for a flt [ed note: flight] to somewhere you have always wanted to go. Get inspired beyond boundries [sic]," she wrote. "Find something waiting!"