Chris Weeks/WireImage
November 07, 2008 11:50 AM

Ashlee Simpson may be only 24 – but, says her dad, she became a full-fledged grown-up the moment she learned she was expecting.

“The day she found out she was pregnant, she became a woman,” Joe Simpson tells PEOPLE.

“She’s concerned about what she eats and how she prepares for the child and [details like], is the baby’s room ‘green’ enough?” he explains. “It’s a transformation you never expect as a parent – you pray for it, but never expect it. She’s ready for this baby!”

And, Simpson says, his son-in-law Pete Wentz is equally prepared for their impending due date.

“Pete is the king of details, so he wants to make sure the baby’s room is just right – the right colors, the right sheets, the right look,” Simpson gushes. “He’s a great parent.”

Auntie Jessica

“Papa Joe” (as he hopes to be called) also says that his eldest daughter Jessica is eager to assume the mantle of doting auntie.

In fact, Simpson – who manages the careers of both his daughters – says he’s doing everything he can to keep Jessica from bailing on her ongoing country-music tour.

“I’m trying to keep her out there until the baby’s born,” he adds. “I have a couple of other dates I need her to play!”

Grandpa Joe

In fact, the only Simpson who isn’t completely ready for the new arrival is Joe himself. “I am too young to be a grandpa!” the 50-year-old declares. “But I am excited.”

As for the name of the Simpson-Wentz baby, the former preacher is keeping mum. “I’m not allowed to give any hints,” he insists. “I can tell you it’s not Joe. I wished, I tried, but it didn’t work.”

Excited for Ashlee’s new arrival? Talk about it at Celebrity Baby Blog

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