CELEBRITY BIRTHDAYS (8/4/11): President Barack Obama - 50 Leader of the Free World and our 44th president. Check out how much he's grayed over the last 7 years. L to R: present day, during the 2008 campaign, running for Senate in 2004 ...

You may not agree with his policies but I think we can all agree the POTUS has dance skillz:

--Daniel Dae Kim - 43 Jin on "Lost". Now he's Chin Ho Kelly on the new "Hawaii Five-O" …

True Dat Fact: Kim was born in South Korea and moved to the United States with his family when he was two,growing up in Pennsylvania.

--Cole and Dylan Sprouse - 19 They shared the role of the kid in Adam Sandler's "Big Daddy" and Ross' son Ben on "Friends". Now they have their very own show on the Disney Channel called "The Suite Life on Deck" which used to be known as "The Suite Life of Zack and Cody" …

--Billy Bob Thornton - 56 Actor, writer, musician. He's been married five times, most notably to Angelina Jolie, whom he met when they were doing a movie together in 1999, and while engaged to Laura Dern. He and Angie split up in 2002 after she adopted a Combodian child she named Maddox.

What's it like being on the Willie Nelson's infamous tour bus? Thornton and David Letterman swap stories:

True Dat Fact: Billy Bob believes he is the reincarnation of Benjamin Franklin, and has a fear of antique furniture

--Jeff Gordon - 40 NASCAR superstar ...