JoJo Siwa, 17, took to Instagram to post a sweet Valentine’s Day tribute for girlfriend Kylie Prew. “It’s my first valentines dayyyy!!” she gushed in a caption shared on Sunday, Feb. 14. “No one in the world makes me as happy as this girl does. I’m so thankful to have fallen in love with the most perfect person ever who makes me smile 24/7. I love you more than you’ll ever know!” she added in the sweet post.