ET caught up with the socialite siblings at The Cinema Society's premiere screening of Marvel's Black Panther in New York City on Tuesday, and the new mom gushed over her precious little bundle of joy, Theodora "Teddy" Marilyn.
"She's good. She's very tiny. She's eight weeks," Nicky shared.
On Monday, the 34-year-old heiress posted the first photo of her daughter to Instagram, writing, "Kisses + cuddles before out the door to catch the @oscardelarenta show."