Referring to her sister-in-law during an interview with The Times, Peltz said: 'I wanted a little sister so bad, and Harper is the sweetest.
'I have the coolest little sister.'
The 27-year-old added: 'She sends me Snapchats.'
Peltz then revealed her and Beckham's plans to start their own family, revealing just how keen her husband is.
'He wants kids yesterday,' she said of Beckham.
As for her: 'I think in a couple of years. We definitely want a big family. He has three siblings, I have seven,' Peltz explained.
After being asked whether eight kids are on the horizon for the pair, Peltz responded: 'It’s a lot but . . . I don’t know.'
She added: 'We want to adopt some kids, have some of our own. That would be the dream.'
The actor spoke dotingly of her husband too, saying: 'I love when Brooklyn’s protective of me, I find that sexy. We do everything together.'
Peltz previously denied 'feud' rumours regarding her relationship with her fashion designer mother-in-law Victoria Beckham.
This came after Peltz didn't wear a VB design on her wedding day.
In her recent interview, she reiterated that Victoria simply couldn't make the dress in time, and insisted 'the real truth is, I really, really wanted to wear it and I thought it was so beautiful that Brooklyn’s mum got to make that for me!
'And I was really excited to wear it! And I didn’t end up wearing it.'
During an appearance on the Today show, aired earlier this month, Victoria, herself, gushed about her son Brooklyn and daughter-in-law Peltz's 'beautiful wedding'.
She said: 'As a mother, to see my son so happy means so much.
'What more can you ask for?'
Peltz and Beckham married on April 9 at her billionaire father Nelson Peltz's estate in Palm Beach, Florida.
The bride wore a beautiful Valentino Couture gown.
According to The Sun, the father of the groom, David Beckham, gave an emotional speech that involved him crying and having to 'stop to take a breather'.
During his 'very sweet speech', he reportedly addressed Peltz when saying: 'We love you so much. We are excited that you'll be part of the family.'
Peltz and Beckham, who married after a whirlwind romance, first publicised in 2020, honeymooned in the South of France.
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