<P> Winter obtained her first entertainment industry job in a Cool Whip commercial advertisement in 2002 when she was four years old . She had her first television role in an episode of Listen Up ! , and followed it with appearances in a variety of shows such as Freddie , Monk , Bones , and ER . In the animated children 's show Phineas and Ferb , she voiced the character of Gretchen before winning the regular role of Alex Dunphy in the series Modern Family , which premiered in 2009 . She has continued to work in TV animation , including providing the voice of Marina the Mermaid on Disney Junior 's Jake and the Never Land Pirates . In 2012 , Winter was cast as Sofia , the lead character in a then - new Disney animated franchise Sofia the First . The series premiered in January 2013 on Disney Junior . In 2014 , she voiced Penny Peterson , Sherman 's enemy turned friend in the 2014 Dreamworks Animation film Mr. Peabody and Sherman . She also lent her voice to characters in the animated films , Disney 's Bambi II and Blue Sky 's Ice Age : The Meltdown . </P>
<P> Winter obtained her first entertainment industry job in a Cool Whip commercial advertisement in 2002 when she was four years old . She had her first television role in an episode of Listen Up ! , and followed it with appearances in a variety of shows such as Freddie , Monk , Bones , and ER . In the animated children 's show Phineas and Ferb , she voiced the character of Gretchen before winning the regular role of Alex Dunphy in the series Modern Family , which premiered in 2009 . She has continued to work in TV animation , including providing the voice of Marina the Mermaid on Disney Junior 's Jake and the Never Land Pirates . In 2012 , Winter was cast as Sofia , the lead character in a then - new Disney animated franchise Sofia the First . The series premiered in January 2013 on Disney Junior . In 2014 , she voiced Penny Peterson , Sherman 's enemy turned friend in the 2014 Dreamworks Animation film Mr. Peabody and Sherman . She also lent her voice to characters in the animated films , Disney 's Bambi II and Blue Sky 's Ice Age : The Meltdown . </P>
who does ariel winter voice on phineas and ferb
who does ariel winter voice on phineas and ferb
Gretchen
Gretchen