On Saturday, Reese Witherspoon wished her little boy, Tennessee, a happy birthday on Instagram. To celebrate the day, Reese shared two snaps: one of Tennessee looking like a stud in blue sunglasses and shorts, and one showing off his cool cake. "Happy Birthday Sweet boy! 3 is a magic number," Reese wrote. This isn't the only birthday Reese celebrated recently ? Ava Phillippe turned 16 earlier this month, and Reese also honored the occasion a special shout-out. The wishes are a small slice of Reese's family life, which she freely shares in plenty of frame-worthy pictures on social media.