8. CHRISTINA AGUILERA

After Aguilera became rich and famous, her biological father came out of the woodwork wanting to reconnect. Xtina's mother left the abusive Fausto Aguilera while their daughter was young, and the emotional scars are still the focus of her songs "I'm OK" and "Oh, Mother". The only time Aguilera regretted the "non-existent" relationship was when she had no one to walk her down the aisle.