Brooke Shields ' daughters Rowan and Grier Henchy have paid tribute to their mom on her 60th birthday.

"Happy birthday to my role model, partner in crime, and best friend. Thank you for always being my rock," Rowan, 22, wrote via her Instagram Story on Saturday, May 31.

Rowan shared multiple family photos in honor of Shields' milestone birthday on Saturday, in addition to referring to her mom as "everyone's favorite girl boss" in one slide. Grier, 19, called Shields "the coolest mama I know" and shared a vintage picture of her mother kissing her as a baby.

"Happy birthday mama," Grier added via her Instagram Story .

Shields celebrated her special day by posing in a skimpy black bikini while she relaxed on a beachside hammock.

"Woke up today in paradise… and in a new decade of l

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