Amanda Michelle Seyfried (/ˈsaɪfrɛd/ SY-fred; born December 3, 1985) is an American actress. She began acting at 15, with recurring roles as Lucy Montgomery in the CBS soap opera As the World Turns (1999–2001) and Joni Stafford in the ABC soap opera All My Children (2003). She came to prominence for her feature film debut in the teen comedy Mean Girls (2004) and her roles as Lilly Kane in the UPN mystery drama series Veronica Mars (2004–2006) and Sarah Henrickson in the HBO drama series Big Love (2006–2011).

Seyfried has starred in many films, including Mamma Mia! (2008) and its sequel Mamma Mia! Here We Go Again (2018), Jennifer's Body (2009), Dear John (2010), Letters to Juliet (2010), Red Riding Hood (2011), In Time (2011), Les Misérables (2012), A Million Ways to Die in the West (2014), Ted 2 (2015), and First Reformed (2017).