Rebecca Alie Romijn-O'Connell (/roʊˈmeɪn/ roh-maynDutch: [roːˈmɛin]; born November 6, 1972) is an American actress and former fashion model. She is best known for her role as Mystique in the first trilogy of the X-Men film series, and as Joan from The Punisher (2004), both of which are based on Marvel Comics. She also had a recurring role as Alexis Meade on the television series Ugly Betty. She recently played as Eve Baird in The Librarians from 2014 to 2018. On Friends portrayed Cheryl in episode The One with the Dirty Girl.

She is currently married to Jerry O'Connell since 2007 and has two daughters.