Happy Bday Barack! As POTUS turns 51, take a look at back at some of his most memorable moments with famous friends
Witherspoon and her How Do You Know costar Paul Rudd got to pay the White House a visit in 2010. "Obama came out and he turned to Paul and said, 'I loved you in I Love You Man.' I grabbed Paul and was like, 'Are you freaking out right now?' He's like, 'I'm freaking out!'" Witherspoon recalled.