Britney Spears has crushed all competition on Twitter.com - the pop princess has become the first person on the social networking site to garner more than 5 million followers. The "Toxic" hitmaker overtook actor Ashton Kutcher, the first member to reach one million supporters, as the most popular celebrity on the forum last week, but she set a new record by Saturday with a fan following of 5,015,346.

And Spears has already been thanking fans for their support - she invited devotees to send in their questions via her Twitter blog and she responded to them throughout the week.