While Bill Clinton delivered a speech discussing the enduring disaster in Puerto Rico, the younger Bush smiled and appeared to whisper something to Obama, making him laugh behind Bill Clinton.
The giggly moment has since gone viral, with many users online tweeting about how much they enjoyed watching the two bond.
"W cracking a joke to Obama while Clinton gives a speech is me in middle school," one user wrote, while another added, "Bush pulling a dad move, cracking a joke to Obama during Clinton's speech, and glancing repeatedly to see his reaction."
Here is a photo gallery for all the fun between the 5 living former U.S. Presidents, giggling and enjoying there time together, regardless of party affiliation. Plus reactions across social media about the hilarious moment between Presidents Bush and Obama! LOL.