Nicole Kidman marked her daughter Sunday Rose's 18th birthday with a loving tribute on Instagram this Tuesday.

The actress, 59, shared childhood photos of Sunday, writing, "Happy 18th my angel, you couldn't be more loved." Sunday, who is also the daughter of country singer Keith Urban, 58, recently transitioned into a modeling career, walking the runway for Dior at Paris Fashion Week on Monday. This appearance came just one day before her milestone birthday.

Sunday's foray into modeling at age 16 drew public scrutiny, with some online commentators criticizing her expression, runway walk, and labeling her a "nepo baby." Despite the backlash, she has continued her modeling pursuits, including a debut at the Met Gala in May, where she wore Dior alongside her mother, who was a co-chair of the event.

Kidman, who shares Sunday and 15-year-old Faith Margaret with Urban, finalized her divorce from the singer in January after 19 years of marriage. The divorce agreement reportedly leaves custody of the daughters primarily with Kidman, with Urban receiving 59 days annually with the children.

Reports have circulated regarding Urban's new relationships, with speculation of him dating younger singers, which insiders suggest has caused tension with his daughters. A source reportedly told a celebrity reporter that the girls were "focused on mum right now" and adjusting to their parents' separation. The 59-year-old shares Sunday and a 15-year-old daughter called Faith Margaret with her ex-husband Keith Urban, 58; Kidman pictured with Sunday (left) and Faith (middle) in March

Kidman, who faced her own early career criticisms, reportedly expressed empathy for her daughter's experience. An insider told the Daily Mail that Kidman understands the nature of criticism but that it also brings back difficult memories of her own start in the industry. The actress's advice to Sunday has been to avoid social media and that she will support her daughter's chosen path. Reese Witherspoon, Kidman's co-star from "Big Little Lies," also extended birthday wishes to Sunday in the Instagram comments.

Kidman's tribute was accompanied by childhood throwbacks, including one of Sunday in an angel costume. Kidman's birthday message was accompanied by a pair of childhood snaps of Sunday, one of her in Kidman's arms and another of her scampering about in an angel costume

Sunday's modeling debut occurred at the Miu Miu show in Paris Fashion Week in October 2024. At the time, she appeared alongside other celebrity children, including Amelia Hamlin and Eliot Sumner. This Monday, one day before celebrating her 18th birthday, she paraded down her latest catwalk this Monday for the Dior show at Paris Fashion Week

Kidman and Urban's divorce was finalized in January, with both parties waiving child support and alimony rights. The parenting plan awards Kidman primary custody for most of the year. Tuesday marked Sunday's first birthday since her parents finalized their divorce this January, having separated last summer after a marriage of 19 years; Kidman and Urban pictured May