Alyson Stoner (born August 11, 1993, in Toledo, Ohio) is an American actress, dancer and singer who voices Isabella Garcia-Shapiro (for which she came up with Isabella's catch phrase "Whatcha doin?") and Jenny on Phineas and Ferb. Besides this, she is perhaps best known for playing Sarah Baker (one of the twelve children) in Cheaper by the Dozen and its sequel Cheaper by the Dozen 2. Stoner also co-starred in "Camp Rock" a Disney Channel original movie with Demi Lovato and Joe Jonas, and had a recurring role on The Suite Life of Zack and Cody as Max. Alyson co-hosted of the Disney Channel's Mike's Super Short Show, an infomercial segment that sells upcoming DVD and Video releases of Disney features, and also starred in three of the four Step Up movies.