Lionel Richie: Nicole a 'Nervous Wreck'

Lionel Richie says the stress of his daughter's expanding career is most likely the reason for her shrinking dress size.

"I know what's happening with her right now, she's a nervous wreck," Richie says of Nicole, who was heavier when she co-starred with Paris Hilton on "The Simple Life."

"She's like her father, you can either blow up or you can shrink away," the R&B crooner told "Access Hollywood" in an interview. "And right now, she's just feeling a little bit of the pressures of her new business. So in this case ... she will be all right."

"Dad is on the case," he said.

The 24-year-old Richie has said she was always really thin, but went through a heavier stage during the first season of "The Simple Life."

In October, FOX announced that feuding ex-friends Richie and Hilton would not return for a fourth season. The network said its midseason schedule didn't have a time slot for the reality series.

Richie is engaged to Adam Goldstein, a professional club disc jockey who goes by DJ AM.

Her new novel, "The Truth About Diamonds," is described by ReganBooks as a "no-holds-barred look at Hollywood's new elite, behind the velvet ropes, inside star-studded premieres and parties."