Nicola Peltz Says in-Law Harper Beckham Is Her ‘Dream Little Sister’: ‘I’m So Blessed’ (Exclusive)

Nicola Peltz Beckham and Harper Beckham are two peas in a pod!

At the premiere of Nicola’s directorial debut Lola on Saturday, the actress and model, 29, reflected on her relationship with husband Brooklyn Beckham’s younger sister.

When asked about whether her real-life bond with Harper, 12, inspired the sibling bond found in her new film, Nicola told PEOPLE that the preteen “is my dream little sister.”

“If I could create the perfect dream little sister, it’s her,” she added. “I’m so blessed I get to have her as my little sister in my life.”

Nicola also told PEOPLE at the Regency Bruin Theatre that her character’s brother Arlo, played by Luke David Blumm, is “based off” her godson, who also attended the Saturday premiere.

“I took a lot of inspiration from him, from our relationship,” she said.

“And yeah, I tried to capture the love and the light of these people,” Nicola added. “And obviously, some characters are made up, but I hope when people watch that they feel that.”

While Harper wasn’t at the premiere, Nicola’s husband Brooklyn, 24, and some other Beckham family members were.

On the red carpet, the couple posed for photos with Cruz and Victoria Beckham, and Nicola praised her mother-in-law for designing her premiere outfit — a custom corset and trouser set from Victoria’s synonymous brand.

“She is a genius,” the actress told PEOPLE of the fashion designer, 49. “I am so honored to be able to wear this tonight. I feel so business, but sexy, and she’s a genius.”