Lyndsy Marie Fonseca is an American actress best known for her roles as Colleen Carlton on the CBS soap opera The Young and the Restless and Alexandra Alex Udinov on The CW show Nikita She was 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 threeyear contract In she had a recurring role as Ted Mosbys future daughter on How I Met Your Mother and as Donna on HBOs Big Love She starred in the 2005 Hallmark TV film Ordinary Miracles as a 16yearold juvenile delinquent who goes to live with a judge Jaclyn SmithIn fall 2007 she played Dawn in the film Remember the Daze She joined the cast of ABCs Desperate Housewives as the daughter of Katherine Mayfair Dana Delany a character moving onto Wisteria Lane In 2008 she was nominated at the Screen Actors Guild Awards for Outstanding Performance by an Ensemble in a Comedy Series for Desperate Housewives 2004 shared with the cast She played Katie Deauxma in the 2010 superhero film KickAss which also featured her Nikita costar Xander Berkeley in the cast She appeared in three more films in 2010 including Hot Tub Time Machine and she was cast as new recruit Alex on the CWs Nikita She was listed at 62 in the 2010 Maxim Hot 100 and 89 in the 2011 list