Lyndsy Fonseca (born January 7, 1987) is an American actress. She is known for portraying Colleen Carlton on the CBS soap opera The Young and the Restless (2001–05), Ted's daughter on How I Met Your Mother (2005–14), andAlexandra "Alex" Udinov on The CW's hit show Nikita (2010–13). Starting in 2015, she had a recurring role on Marvel's Agent Carter as Angie Martinelli.
Fonseca was born in Oakland, California, the daughter of Lima Lynn (née Bergmann) and James Victor Fonseca. Her father is of Portuguese descent, and her mother is of half Portuguese ancestry. Her stepfather is an attorney Reid Dworkin, and her younger half-sister is Hannah Dworkin. Fonseca was raised first in Alameda; after her mother remarried, she moved to Oakland, and then to Moraga. Fonseca graduated from Barbizon Modeling and Acting School in San Francisco and was then discovered by a talent manager in San Francisco. She then relocated to Los Angeles for her first pilot season at age 13, in the middle of the school year. The following year, she landed her breakthrough role, playing Colleen Carlton on The Young and the Restless with a three-year contract. With that, her mother and stepfather moved the whole family to Los Angeles. Since the end of her contract, Fonseca has booked many roles in television and films.
In 2005, Fonseca earned a recurring role as Ted Mosby's future daughter on How I Met Your Mother and as Donna on HBO's Big Love. She starred in the 2005Hallmark TV film Ordinary Miracles, as a 16-year-old juvenile delinquent who goes to live with a judge (Jaclyn Smith).
In fall 2007, Fonseca played Dawn in the film Remember the Daze. She joined the cast of ABC's Desperate Housewives as the daughter of Katherine Mayfair (Dana Delany), a character moving onto Wisteria Lane. In 2008 she was nominated for the Actor award at the Screen Actors Guild Awards for Outstanding Performance by an Ensemble in a Comedy Series for Desperate Housewives (2004), shared with the cast.
Fonseca played Katie Deauxma in the 2010 superhero film Kick-Ass, which also featured her Nikita co-star Xander Berkeley in the cast. She appeared in three more US films in 2010, including Hot Tub Time Machine. In 2010, she was cast in the CW television series Nikita as Alex, a new recruit. Fonseca was listed at No. 62 on the 2010 Maxim Hot 100 and No. 89 on the 2011 list.