Click on photos for more pictures of Princess Stephanie and her daughter.
The chic mother-daughter duo couldn't have looked more stunningly similar in monochrome outfits.
Donning black trousers, a white blouse and a long black overcoat, Princess Stephanie completed her look with a dash of red lipstick and a sleek, tight ponytail.
Her 19-year-old daughter Pauline followed suit in a white shirt, black jeans and a matching black blazer. The on-trend royal brightened up her outfit with leather biker boots and a silver grey diamante clutch.
As president of charity Fight Aids Monaco, Princess Stephanie was attending the auction held in Monaco on World AIDS Day, to raise money for her foundation. Pauline showed her support as she stood by her mother and happily posed for photographs.
The duo were pictured in front of one particularly stunning piece of artwork – a painting of Princess Stephanie's late mother Grace Kelly, which shows the striking American actress holding a faraway gaze.
This is not the first time Pauline has stepped out to support her mother's foundation. Earlier this year the blossoming royal attended the Monaco Fight AIDS Summer Gala, alongside her mother and older brother Louis Ducruet.
At the August ball, the trio dazzled in coordinating outfits and showed off their sun-kissed glows.