The 47-year-old posted the message on his Facebook page along with an adorable picture of himself carrying little Willow, reported People magazine.
"Happy Birthday, my Bean. 15 years old today!!" he wrote. "When you were born it took about 2 seconds to realise that I was willing to die for you. Thank you for correcting my heart - and teaching me how to love without constriction or condition," he wrote.
The teenager became a pop sensation with the release of "Whip My Hair" at the age of 9 and has recently signed a modelling contract with the agency that represents popular face like Kendall Jenner.
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