In 2003, she reprised her role in the third film of the Spy Kids series, Spy Kids 3-D: Game Over, which grossed 7 million worldwide.In 2006, Osment got the role of Lilly Truscott in the Disney Channel series Hannah Montana, the best friend of Miley Stewart and girlfriend to Oliver Oken on seasons 3 and 4.On December 25, Osment hosted the Walt Disney World Christmas Day Parade with Hannah Montana co-star Mitchel Musso.The parade featured acts like Miley Cyrus and the High School Musical cast.She performed several songs for the movie, including "Don't Ya Just Love Christmas" and "One Day".Emily sings the chorus of the song Billy Ray Cyrus "You've Got a Friend" , from his album 2007 Home at Last.Since 2014, she has starred in the Freeform series Young & Hungry as Gabi Diamond.and Theresa Osment (née Seifert), an English teacher. Her father has appeared in various films, including her movie Soccer Mom, and her older brother is Academy Award-nominated actor Haley Joel Osment.
In 2009 she signed with the Wind-up Records label and released "All the Way Up", the first single from her EP debut, All the Right Wrongs, released on October 26, 2009.
In 2008 she starred in the film Soccer Mom, and was ranked on No.
1 on Parade magazine and Forbes to Hot Kid Stars To Watch list. 1 at Top Heatseekers About the album, Osment said: "The songs on the album are from four different people, I wrote with four different people, and they all had to fit on the album together…I kind of just did my own thing.
Osment has also recorded a song titled "I Don't Think About It" in The Haunting Hour: Don't Think About It, for which they made a music video.
The video was released in Haunting Hour DVD and premiered at Cartoon Network.