Nicole Kidman celebrates 'darling' daughter Sunday's 12th birthday with sweet snap

Nicole Kidman couldn't help but gush about "darling" daughter Sunday Rose Kidman Urban as her little girl turned 12 years old on Tuesday.

"Birthday hugs for our darling Sunday," the "Big Little Lies" actress, 53, captioned a photo of the two of them embracing. "Happy Birthday baby girl xx."

The fact that Sunday's face isn't visible shouldn't come as much of a surprise to fans as she and husband Keith Urban are known to keep their kids hidden from the public on their social media accounts. Even photos such as this are rare.

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Kidman and the 52-year-old country singer, who recently celebrated their 14th wedding anniversary, are also parents to daughter Faith Margaret Kidman Urban, 9.

Though Urban only has these two children, Kidman is also mom to the two kids she and her ex-husband, Tom Cruise, adopted during their time together: daughter Isabella Cruise, 27, and Connor Cruise, 25.