In 2008, Amanda was in love with Dominic Cooper. Dominic Cooper is also an actor and he is mainly known for his role in Mamma Mia!, The Duchess, The History Boys and many more. They dated each other till 2010.
In 2013, Amanda began dating American actor, Justin Long. They were one of the happiest and lovely couple at that time but this love life also came to an end in September 2015. Amanda has never been married and she has also never been the loving spouse of anyone.
Cute and adorable, Amanda began her career as a model. She was seen in print ads for clothing companies like Limited Too. However, later she lost her interest in modeling and then she quit her job as a model and then she took the job of waitress in a retirement community. She induced her interest in acting during that time and then she took several voice lessons, she also studied opera. She made her acting debut as an extra in television series Guiding Light. In 1999, she played the role of Lucinda "Lucy" Montgomery in the television series, As the World Turns and then she finally won her debut movie role in 2004 movie, Mean Girls. Her net worth is $10 million.