Former presidents George H.W. Bush and Bill Clinton hang out

There was a special moment between two presidents today as President George H.W. Bush tweeted a picture showing off some Bill Clinton socks with President Clinton standing right next to him!

The tweet says, "Special visit today with a great friend -- and now, a best-selling author. Luckily I had a freshly laundered pair of Bill Clinton socks to mark the occasion."

Clinton just published a book with author James Patterson.