Trouble in paradise?? According to sources, Jessica Simpson skipped her nephew’s birthday party in order to avoid her father!

Even though Tina Simpson and Joe Simpson’s divorce is supposed to be “amicable”, it looks like Jessica is “appalled” by her father’s rush back into the dating world.

The Fashion Star mentor — who is expecting her second child with Eric Johnson, her fiance of two years — even skipped her little sister Ashlee Simpson’s birthday party for 4-year-old son Bronx Wentz because she couldn’t stand to be in the same room as Joe. “One of her girlfriends says it’s because she doesn’t want to be anywhere near her dad,” a source says in the Dec. 10 issue of Us Weekly.

Even with Jessica absent, “Bat for a Heart” singer Ashlee, 28, and her ex-husband, Fall Out Boy rocker Pete Wentz, 33, hosted a comic-themed fete for their soon at the Coop in L.A.’s Studio City Nov. 20. Jessica’s fellow Fashion Star mentor Nicole Richie, 31, and her firstborn, Harlow, 4, also attended.

“The kids put on costumes and took pictures in a photo booth,” a source says of Bronx’s party. “It was sweet!”

Jessica, meanwhile, is gearing up for the arrival of baby No. 2. “Jessica loves being a mom,” says an insider. “She is really overjoyed.”

I don’t care who you’re mad at – you don’t skip the nephew’s birthday party. Seriously? You know how many awkward birthday parties I’ve gone to in my day? That’s awful, if that really was the case.

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