New Couple Ryder Robinson and Iris Apatow Grew Up Together: 'They've Known Each Other a While' (Source)

New couple Ryder Robinson and Iris Apatow grew up side by side together.

Ryder, the son of Kate Hudson and her ex-husband Chris Robinson, went Instagram official with girlfriend Iris, the daughter of Judd Apatow and Leslie Mann, on Valentine's Day. The 18-year-old shared two photos with Iris, 19, kissing her on the cheek and including a heart emoji in the caption.

Their famous families gave their stamps of approval in the comments section, including Hudson, 42, who wrote, "Sweets 💞." Mann, 49, posted three heart emojis, and Iris' older sister Maude Apatow said, "So cute :')."

A source tells PEOPLE, "They both live on the westside part of L.A. and grew up there. They both attended the same school in Santa Monica. They've known each other for a while."

"It's a small, tight-knit celeb community over there," the source adds. "A lot of those kids have grown up together since they were really young."

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Hudson also shares son Bingham, 10, with ex Matt Bellamy, and 3-year-old daughter Rani Rose with fiancé Danny Fujikawa. The actress celebrated her eldest son's 18th birthday in January, penning a heartfelt tribute to Ryder on his big day.

"And then he was 18 ❤️," Hudson wrote alongside a gallery of photos with Ryder over the years, beginning with a snap from her pregnancy and ending with a recent selfie together.

"My heart is filled with love and excitement for your future," she added. "Ryder you incredible, unique, hilarious, loving human, I love you beyond. Happiest Birthday @mr.ryderrobinson PS Now your life is your responsibility and outta my hands! Good luck son!!!"