Mandy Moore is not an actress.
Amanda Leigh Moore ( born April 10 , 1984 ) is an American singer-songwriter and actress . In 2001 , she made her film debut in the comedy Dr. Dolittle 2 , though it was only a minor voice role . Later that year , she co-starred as Lana Thomas in the comedy The Princess Diaries with Anne Hathaway . In 2002 , she made her starring debut with Shane West as Jamie Sullivan in the romantic drama A Walk to Remember , which was based on Nicholas Sparks ' novel of the same name . In 2016 , she began starring as Rebecca Pearson in the NBC family comedy-drama series This Is Us for which she received a Golden Globe Award nomination .