Marialejandra Delfino was born in Caracas, Venezuela, and raised in Miami, FL by her Cuban and Venezuelan parents. The future star took an interest in performing arts at a young age, from dancing in a Miami Ballet production of "The Nutcracker" when she was 10, to forming an all-girls singing group named China Doll along with her best friend Samantha Gibb (the daughter of Bee Gees' Maurice Gibb). Delfino pursued acting when she was 14 after her mother reportedly granted her a six-month window to book a job. Within that time, Delfino landed a supporting role opposite Steve Guttenberg and Kathleen Quinlan in the family comedy "Zeus and Roxanne" (1997). She starred in her first feature two years later as an angst-ridden teen who discovers her father (Eugene Levy) is having an affair in "The Secret Life of Girls" (1999). With her acting dreams coming to fruition, Delfino moved to Los Angeles, and soon landed her breakout television role.In 1999, Delfino was cast in the science fiction drama "Roswell," based on the young adult book series Roswell High (1998-2000) written by Melinda Metz. She played Maria DeLuca, a straight-talking and peppy teen living in Roswell, New Mexico - the site of a mysterious extra-terrestrial crash in 1947 - along with her best friend and fellow diner waitress Liz Parker (Shiri Appleby). The show also starred Katherine Heigl, Jason Behr and Brendan Fehr as a trio of aliens whose spaceship crashed during the 1947 incident. "Roswell" garnered favorable reviews from critics and drew in audiences who enjoyed similar sci-fi shows such as the cult hit "Buffy the Vampire Slayer" (The WB, 1997-2001). The series even aired after "Buffy" on its third and final season. During her hiatus from "Roswell," Delfino landed a minor role in the critically acclaimed film "Traffic" (2000) The Steven Soderbergh-directed crime drama explored illegal drug trading in the United States and featured an A-list ensemble, including Michael Douglas, Benicio del Toro and Catherine Zeta-Jones. In the film Academy Award-winning film, Delfino played a privileged junkie.Following the success of "Roswell" and showcasing her versatile acting in "Traffic," Delfino returned to her music roots in 2000 and independently released three songs on the Internet as Majandra. The following year, she released the EP The Sicks on her own label Dripfeed Records. Delfino's second studio album Tarte (2007) featured blended indie rock, electronic, and dark cabaret genres. Delfino landed another regular television role on the short-lived drama "Quarterlife" (NBC, 2007) about a group of young professionals and artists whose lives are connected via a social networking site. One of her co-stars on the show was actor David Walton, whom Delfino married in March 2011. She reunited with "Roswell" costar Katherine Heigl in the romantic comedy "Life as We Know It" about two single adults (Heigl and Josh Duhamel) who are left to raise their best friends' orphaned daughter. In 2011, Delfino co-starred with Raven-Symoné on the comedy series "State of Georgia." She played a science geek living in New York who takes in her aspiring actress friend (Symoné) as a roommate.