Ariel Winter (born January 28, 1998) plays Gretchen in Phineas and Ferb and Wendy Stinglehopper in "Phineas and Ferb Christmas Vacation". She played a younger version of Christina Ricci's character Trixie in Speed Racer. She currently stars as Alex Dunphy on ABC's Modern Family and Marina the Mermaid on Jake and the Neverland Pirates. She will also voice Sofia in the future Sofia the First TV series and movie.