Nicky Hilton's New York City baby shower was a classy affair.

Paris Hilton shared a few snaps from the baby shower she hosted for her younger sister, Nicky Hilton, on Wednesday, which was held at the swanky Towers of the Waldorf Astoria. Donning a gorgeous embroidered, floor-length dress, the 35-year-old heiress posed for a cute picture with her pregnant sister, who chose a delicate lacy white dress for the occasion.

"Makes me so happy to see my sister so happy, beautiful & glowing," Paris Instagrammed. "So excited for her starting her new family. #Blessed."

PHOTOS: Nicky Hilton Turns Tight Dolce & Gabbana Minidress Into Maternity Wear

"Can't wait to meet this little girl! #AuntParis," she also shared, touching Nicky's baby bump.

Clearly, good looks run in the family. Paris and Nicky posed with their mother, Kathy Hilton, at the event. "Beautiful day with my mom & sis. Love my family so much!" Paris gushed.

Real Housewives of New York City star Bethenny Frankel was also in attendance on Wednesday, and Instagrammed selfies with the Hilton sisters.

And check out Nicky's adorable cake.

"Hosted a beautiful baby shower for my sister @NickyHilton today at the #WaldorfTowers," Paris wrote. "Love her #Porthault cake & seeing all our New York friends together to celebrate the new baby."

Wednesday actually marks Nicky's second baby shower. The 32-year-old heiress also celebrated with her California crew last month at the Hotel Bel-Air in Los Angeles, including actress Bijou Phillips. Her aunt, Real Housewives of Beverly Hills star Kyle Richards, and Kyle's daughter, Brooke Wiederhorn, were also in attendance.

"All the girl cousins," Wiederhorn captioned a family pic.

PHOTOS: It's a Girl! Nicky Hilton Has Luxurious Baby Shower at Hotel Bel-Air

Nicky and her husband, James Rothschild -- an heir to one of Europe's greatest banking families -- are expecting their first child together, a baby girl, this summer. The couple tied the knot during a lavish ceremony at Kensington Palace in London last July.

Watch the video below for a look back at Nicky's incredible Valentino wedding dress.