President Barack Obama may be the leader of the free world, but actor Ashton Kutcher is the king of twitter and pop princess Britney Spears is, USA/OBAMAer, its princess.

 Obama’s twitter feed recently attracted its 3 millionth follower, which was announced with this tweet — “As we kick off 2010, our Twitter community has grown to over 3 million. I continue to be grateful for your partnership as we work for change” — on Monday afternoon.

The development made Obama’s feed — actually run by the Democratic Party’s National Committee — only the fourth ever to garner such attention. But he still remains far behind the leaders, the Hill newspaper noted on its “Twitter Room” blog.  They each have 4 million followers, the blog said, citing TwitterCounter .  

The top three twitter feeds are those of Kutcher, pop’s Britney Spears  and the U.S. comedian and talkshow host Ellen DeGeneres. 

USA/Of course, Kutcher sends his own tweets, of which he wrote: ”I make stuff, actually I make up stuff, stories mostly, collaborations of thoughts, dreams and actions. Thats me.” Recent samples of Kutcher’s missives — which can be up to 140 characters long — include a link to a “sick” snowboarding video, a short thank you note to his vacation (“Dear, Vacation You were amazing. Thank you, Ashton.”) and the observation “Hung over yoga hurts.”