Lada Gaga, Justin Bieber are most charitable celebrities of 2011

(CNN) -- Lady Gaga tops DoSomething.org's list of the Top 20 Celebs Gone Good for the second year in a row, according to the site.

The list, compiled by the volunteer organization, ranks celebrities according to their charitable work and donations.

The "Born This Way" singer held on to her No. 1 spot thanks to her anti-bullying efforts, like her Born This Way Foundation. Gaga is followed by fellow pop star Justin Bieber.

Bieber, who sat at No. 10 on last year's list, nabs second place in 2011. He launched the Believe Charity Drive, benefiting music education and children's cancer, and also encouraged fans to participate in Pencils of Promise, which raises money for new schools.

George Clooney comes in third place, followed by Will Smith and Jada Pinkett Smith and Leonardo DiCaprio.

Will and Jada also aren't the only power couple who give back. Blake Shelton and Miranda Lambert, Ashton Kutcher and Demi Moore (despite splitting up in November) and Brangelina also made the list.

(Flying solo, Nick Cannon makes the list without wife Mariah Carey.)

For the full list, visit DoSomething.org.