Actress Reese Witherspoon is definitely one of the cool moms and she can prove it! She recently got her 15-year-old son Deacon Phillippe to fill her in on what TikTok is and how to use it. Without much hesitation, he tried to show his mom the ropes, but wasn't quite prepared to handle how goofy she looked doing it. "You look pretty cool when you do that," he said, making his mom laugh. "@deaconphillippe tries to teach me how to Tik Tok. I think I nailed it..." she captioned the video of their mother-son bonding session on Instagram.