Christie Brinkley Remembers David Bowie with Touching Story of How She Helped His Widow Iman Conceive Daughter Alexandria

"My heart aches for Iman, and Alexandria for their untimely and unbearable loss," Brinkley wrote.

Photo: Robin Marchant/Getty; Michael Stewart/WireImage

Christie Brinkley is remembering her friend David Bowie with a joyous memory.

The 61-year-old shared a heartfelt story about Bowie’s widow Iman and the couple’s daughter Alexandria, 15, on her Instagram Tuesday.

“Iman always told the story in such a charming way… ‘It took two blondes to get me pregnant David Bowie and Christie Brinkley!'” Brinkley wrote.

Along with her sweet caption, the mother of three shared a portrait of the late rock star and the Somali-American supermodel posing adoringly with their newborn Alexandria.

“‘You see…’ Iman explained to me, ‘in Somalia they say if you are having trouble getting pregnant you must hold a baby all day’ so I handed her my baby, Sailor, and she held her all day long,” Brinkley continued adding, “And sure enough, it worked! After 7 years trying without luck… Iman got pregnant!”

Bowie, 69, and Iman, 60, – who married in 1992 – welcomed their only child together in August 2000. The music legend had son, Duncan, from his previous relationship, and the actress had son, Spencer, from her first marriage.

“So beyond her great beauty and business savvy, and beyond Bowie’s music and art, I always felt a sweet connection to this stunningly gorgeous and creative couple. Today my heart aches For Iman, and Alexandria for their untimely and unbearable loss. My deepest sympathy,” Brinkley concluded her post.

Bowie died of cancer Sunday in New York, PEOPLE confirmed. “Jan. 10, 2016 – David Bowie died peacefully today surrounded by his family after a courageous 18-month battle with cancer,” his son Duncan informed fans on his father’s official Facebook page.

Following her husband’s passing, Iman took to Twitter hours before the announcement tweeting a picture of the words, “The struggle is real, but so is God.”

The couple’s longtime friend Bethann Hardison told PEOPLE exclusively, “[Iman]’s fine. We’re fine. We’re holding up. It comes in waves, you know. He’s a great loss – not just a loss as an artist, but as a human.”