Nicky Hilton, James Rothschild expecting baby No. 2

July 7 (UPI) -- Nicky Hilton is going to be a mom of two.

The 33-year-old heiress' rep confirmed Thursday to Us Weekly that Hilton is pregnant and expecting her second child with husband James Rothschild.

"The couple are thrilled about the new addition to their family," the rep told the magazine.

Hilton and Rothschild, a 32-year-old banking heir, are already parents to daughter Lily Grace, who turns one year old on Saturday. Hilton's mom, Kathy Hilton, told reporters in September that her daughter had taken to motherhood "like a duck to water."

"With my babies, if I wanted to go pick them up I would just go in the room in the middle of the night, but Nicky is very much on a schedule," the 59-year-old former actress said, according to People. "This is nap time, this is tummy time, so I'm just kind of like, 'Okay.'"

"I'll tell her certain things, but she's read up on everything," she added.

Kathy said Lily "looks a lot" like Hilton's elder sister, Paris Hilton. Paris gushed about becoming an aunt in an interview with Us Weekly in May 2016 prior to Lily's birth.

"She's going to be such a beautiful little girl," the 36-year-old designer said. "I love all the dresses I got her. There are so many beautiful dresses and little princess outfits. So I can't wait to see her in them."