Here are some of the Stars who have most Twitter Followers:

Mio. ~ Million

Lady Gaga
Followers - 16,1 Mio.
Twitter Name - ladygaga
Following - 141,000
Tweets - 1,120

Justin Bieber
Followers - 14,7 Mio.
Twitter Name - justinbieber
Following - 119,000
Tweets - 12,202

Katy Perry
Followers - 12,2 Mio.
Twitter Name - katyperry
Following - 82
Tweets - 3,564

Rihanna
Followers - 9,8 Mio.
Twitter Name - rihanna
Following - 685
Tweets - 3,584

Selena Gomez
Followers - 8,4 Mio.
Twitter Name - selenagomez
Following - 672
Tweets - 1,881

Miley Cyrus
Followers - 3,6 Mio.
Twitter Name - mileycyrus
Following - 87
Tweets - 758

Victoria Justice
Followers - 1,2 Mio.
Twitter Name - victoriajustice
Following - 78
Tweets - 6,363

Demi Lovato
Followers - 5,1 Mio.
Twitter Name - ddlovato
Following - 203
Tweets - 6,792

Jedward
Following - 450,000
Twitter Name - planetjedward
Following - 460
Tweets - 15,239

These informations are a bit old so don't be confused if the numbers changed till now :)
Hope wewe like thoose...if u want that some other stars should be here too..just post a maoni with the names...