Lexi also received a birthday wish from her late father's Instagram account.
"HAPPY SIXTEENTH BIRTHDAY TO LEXI," the post reads. "'Fill your heart with love today, Don't play the game of time...' We're sure you will all want to join us in wishing many happy returns of the day to Alexandria Zahra Jones on her 16th birthday."
The tweet was accompanied by a photo of Lexi with her parents as a newborn in 2000 set side-by-side with a picture of Bowie when he was 16 in 1963.
"Happy Birthday Lexi," the tweet concludes. "Here's wishing you love 'n stuff from everybody here."
Bowie and Iman's romance was legendary. In 2000, Bowie admitted toHELLO! magazine that for him it was love at first sight when he met the supermodel at a dinner party in 1990, just after she had retired.
For Iman, the bond was forged a little later. She told The Cut in 2011 that she decided David was the one about two weeks after she began dating him.
"I was coming from Paris and I got to L.A. at the airport," she told The Cut. "The doors open to the plane and I come out and I see all these people taking a picture of somebody... He was standing there, flowers in hand, no security. That was when I knew he was a keeper."
Bowie died on Jan. 10 after a private 18-month battle with cancer. He was 69.