The 25-year-old “Transformers: Age of Extinction” star posted a selfie Tuesday in which she is seen cuddling up to her soon-to-be husband’s 9-year-old sister, Harper.

“h7 is the sweetest most loving and beautiful little human i know!” she wrote alongside the picture with the youngster, whose middle name is Seven.

The post was approved by Peltz’s future mother-in-law — former Spice Girl Victoria Beckham — who responded with a string of love heart emojis.

Peltz is preparing for a 2021 wedding to the 21-year-old Brooklyn, who surprised her with a marriage proposal in July, after just eight months of dating.

The celebrity scion, whose dad is soccer legend David Beckham, posted a picture of the happy moment on Instagram.

“Two weeks ago I asked my soulmate to marry me and she said yes xx. I am the luckiest man in the world. I promise to be the best husband and the best daddy one day. I love you baby xx,” he wrote.