Holly Madison enjoyed a day at the park with daughter Rainbow Aurora, 17 months Credit: MOVI Inc.

Such a sweet duo! Holly Madison and 17-month-old daughter Rainbow Aurora made a picture-perfect pair while relaxing together at a park in Las Vegas, Nev., earlier this month.

The model, 34, looked very boho-chic in a short, printed peasant dress, which she wore over what appears to be a halter-style bikini top. Her formerly blonde hair, now a rich auburn color, hung in long waves down her back.

Rainbow, meanwhile, rocked an adorable blue and pink and green plaid frock with a little bow on the front. She sat happily in her mom's lap on a blanket littered with toys.

"She's taking swimming lessons," Madison told Us Weekly back in May of her only child with husband Pasquale Rotella. "She's learning a lot and it's really important."

Indeed, the Girls Next Door alum previously told Us her daughter was learning sign language. "Supposedly [babies] can learn to sign before they can speak," she explained. "I've been taking her to sign language class."