Fergie sure has one picture-perfect family [2]! On Saturday, the 40-year-old singer sent a sweet birthday message [3] on Instagram to her adorable little tot, Axl, who turned 2 years old. The precious snap featured Axl in a Top Gun flight suit costume paired with oversize aviators, and we must admit, he looked pretty darn cute! "Happy 2nd bday to my little maverick axl jack duhamel #imtwofoo," Fergie wrote. See the endearing post above, and then check out more of the cutest families on Instagram [4].