In 2008, she had her breakout film role as the title character in "Forgetting Sarah Marshall". She has since appeared in a number of comedy films, including "Couples Retreat" (2009), "When in Rome" (2010), "You Again" (2010), "The Boss" (2016), "Bad Moms" (2016), and "A Bad Moms Christmas" (2017). Bell garnered further recognition for voicing Princess Anna in the Disney animated fantasy films "Frozen" (2013), "Ralph Breaks the Internet" (2018), and "Frozen II" (2019), and the short films "Frozen Fever" (2015) and "Olaf's Frozen Adventure" (2017).