Alanna Ubach was born on October 3, 1975, in Downey, California, to Sidna González and Rodolfo Ubach, making her of Mexican and Puerto Rican descent. She began her acting career at a young age, debuting in the TV film "Moment of Truth: Why My Daughter" and quickly gaining recognition for her role as Josie in the educational drama show "Beakman's World."

Her early film roles included "Airborne" (1993), "Sister Act 2: Back in the Habit" (1993), and "The Brady Bunch Movie" (1995). Her career took off with her role as Serena McGuire in the popular comedy film "Legally Blonde" (2001) and its sequel "Legally Blonde 2" (2003).

She also starred in "Meet the Fockers" (2004) as Isabel Villalobos and voiced Mamá Imelda in the Oscar-winning animated film "Coco" (2017). Her versatility as an actress is evident in her performances in both mainstream and indie films, as well as her recurring roles on TV shows like "Hung," "Californication," and "Girlfriends' Guide to Divorce."

In her personal life, Alanna Ubach is married to musician Thom Russo, and they have a son, Thomas Rodolfo Russo III, born in 2007. The family resides in Los Angeles, where Ubach continues to work in the entertainment industry.

She is known for her dedication to her craft and her ability to bring depth and authenticity to her characters. Throughout her career, she has received several accolades, including a nomination for a Screen Actors Guild Award for her performance in "Bombshell" (2019), where she portrayed Jeanine Pirro.

Her contributions to both film and television have made her a respected and beloved figure in Hollywood.