Lovestruck Dart was born in the Crystal Empire (she's part crystal pony) and lived with her mom, dad, and her older sister, Cosmic Spark. When Lovestruck turned two, the Crystal Empire was invaded by King Sombra and her family had to move to Ponyville where they were safe. A few years went by and Lovestruck went to school. There, she met Sweetie Belle and they became instant friends. At Diamond Tiara's Cutecinera, Sweetie Belle introduced Lovestruck to Scootaloo and Apple Bloom and told her that they were going to form a secret society. Lovestruck asked if she can join and they said yes and the four of them have became best friends and Cutie Mark Crusaders.
Years later, the CMCs got their cutie marks and off helping those who need help. And Lovestruck, she's a student at The School of Friendship, a Cutie Mark Crusader, and helps her friends at the Cutie Mark Camp, and just being herself. ;)