What is it you're not telling me? (inspiration from Vampire Diaries)

Queen Mia Thermopolis became pregnant a few weeks after her coronation. She and Nicholas Devereaux gave birth to a princess called Lydia. But the Council decided a hard fate for the little girl. Lydia must be married at age 18, or drop out from the crown.
Princess Lydia Marie Antoniet Thermopolis Devereaux lives in the tiny country of Genovia with her ​​mother Mia and her father Nicholas. She is one of the most beautiful girls in the country, with deep brown beautiful eyes and long, wavy, beautiful hair. Even when she was fifteen years old, princes stood in line to ask for her hand. But her parents, especially her father, wants her to fall in love, instead of having to choose for her.
On her 17th birthday at the ball, she meets the family Salvator, who rule in Italy.
What happens to her heart when she will meet the handsome prince, Damon Salvator?