Rebecca Alie O'Connell[2][3] (née Romijn /roʊˈmeɪn/ roh-MAYN, Dutch: [roːˈmɛin]; later Romijn-Stamos; born November 6, 1972) is an American actress and former model.

She is known for her role as Mystique in the original trilogy (2000–2006) of the X-Men film series, as Joan from The Punisher (2004) (both based on Marvel Comics), the dual roles of Laure Ash and Lily Watts in Femme Fatale (2002),[4][5][6] and Una Chin-Riley on Star Trek: Discovery (2019) and Star Trek: Strange New Worlds (2022–present).

Her other major roles include Eve Baird on the TNT series The Librarians, voicing Lois Lane in the DC Animated Movie Universe, and as the host of the reality competition show Skin Wars.

[7] Her mother, Elizabeth Romijn (née Kuizenga), is a community college instructor of English as a Second Language (ESL) and textbook author.

[10][11] On The Ellen DeGeneres Show, when questioned about always being glamorous and beautiful, Romijn revealed that in her early teens she was an insecure "drama geek" and that, as a result of her growth spurt, she suffered from scoliosis and was in constant pain.

[12] While studying music (voice) at the University of California, Santa Cruz,[13] she became involved with fashion modeling and eventually moved to Paris, where she lived for more than three years.

She has appeared in advertising campaigns for Escada, Christian Dior, La Perla, Tommy Hilfiger, Furla, Liz Claiborne, J.

She has walked for Giorgio Armani, Sonia Rykiel, and Anna Molinari along with the likes of Claudia Schiffer, Stephanie Seymour, Karen Mulder, Kate Moss, Naomi Campbell, Linda Evangelista, Cindy Crawford, Helena Christensen and Christy Turlington.

[21] Romijn appeared as lab worker Jessie on the Adult Swim live-action show NTSF:SD:SUV:: for two seasons.

[23] In 2019, she was a recurring guest in the second season of Star Trek: Discovery, playing the character of Una Chin-Riley, first officer of the USS Enterprise.