Alexis Merizalde Knapp is an American actress from Avonmore, Pennsylvania.

At age 18, Knapp moved to Los Angeles. There in 2008 she hosted popular internet video series 'Project Lore', a show about the videogame 'World of Warcraft', and also worked as a model before breaking into acting. She appeared in Percy Jackson & the Olympians: The Lightning Thief as Aphrodite Girl and in Couples Retreat. In 2012, she starred in Project X as Alexis and Pitch Perfect as Stacie Conrad, the highly sex-crazed Barden Bella. She also starred in ABC's short-lived series Super Fun Night, written by and starring her Pitch Perfect co-star Rebel Wilson, and alongside another one of her Pitch Perfect co-stars, Anna Camp. Knapp also starred in the Tom Vaughan directed film So Undercover, as Taylor Jaffe. Alexis also has roles in TBS' Ground Floor, portraying Tori, a party girl, who catches up on her sleep at work the next morning. Knapp was also cast in the Lifetime pilot Cinnamon Girl, before it got passed on. Knapp also stars in short film drama Wracked, as Melissa.