Nicky Hilton and James Rothschild Are Expecting Baby No. 2!

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A rep tells ET the two are 'thrilled about the new addition' to their family.

Nicky Hilton Rothschild will soon be a mother of two!

The 33-year-old Hilton hotel heiress and her husband, James Rothschild, are expecting their second child, a rep confirmed to ET on Thursday.

WATCH: Nicky Hilton Steps Out With Newborn Daughter Lily-Grace Just 3 Days After Giving Birth

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

Rumors began swirling that Nicky was pregnant when she cradled her belly as photographers snapped her pic at the Valentino Haute Couture runway show during Paris Fashion Week on Wednesday. The New York native wore a bright pink cape dress by the designer for the occasion, pairing the pretty frock with studded stilettos and silver statement earrings.

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The exciting news comes nearly a year after the two welcomed their first child, daughter Lily-Grace, who turns one on Saturday.

Since Lily-Grace's arrival, the proud mama hasn't been able to stop sharing sweet snaps of her mini-me via Instagram. See some of our favorite Lily sightings below:

WATCH: Nicky Hilton Gives Birth, Welcomes Baby Girl Lily-Grace!