Celebrities have been dominating Twitter for a while now. Just recently Charlie Sheen reached 2 million followers after only being a part of the social networking site for less than a week. While he's hit a definite milestone, he still trails behind a number of celebrities including Ashton Kutcher, Britney Spears and Lady Gaga. Sheen has ways to go to reach the 8 million-plus mark that the top celebrities hold.

All the celebrities on this list have a verified account, meaning Twitter has verified it's actually the celebrity, or someone on the celebrity's team, tweeting. Here's the list of the top 10 celebrities with the most Twitter followers.

1. Lady Gaga
@ladygagaFollowers: 8,627,513Following: 144, 454Joined: 36 months ago Reuters
2. Justin Bieber
@justinbieberFollowers: 7,942,954Following: 108,303Joined 24 months ago Reuters
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4. Barack Obama
@BarackObamaFollowers: 6,868,420Following: 702,061Joined 49 months ago Reuters
Kim Kardashian
Kim Kardashian Reuters
6. Ashton Kutcher
@apluskFollowers: 6,416,801Following: 618Joined: 31 months ago Reuters
7. Ellen Degeneres
@TheEllenShowFollowers: 6,416,801Following: 48,893Joined 31 months ago Reuters
8. Katy Perry
@katyperryFollowers: 6,96,299Following: 69Joined 25 months ago Reuters
9. Taylor Swift
@taylorswift13Followers: 5,518,657Following: 53Joined 27 months ago Reuters
10. Oprah Winfrey
@oprahFollowers: 5,269,529Following: 22Joined 26 months ago Reuters
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