On The Tonight Show with Jay Leno, Michelle Obama said that while her husband's singing performance during a recent fundraiser was "completely spontaneous" ("I didn't even hear about it until it got on YouTube"), he does sing to her all the time.Check out what else Michelle had to say about the president's vocal abilities, and what his daughters think about their dad's performances.The first lady also was asked to weigh in about Republican presidential candidate Mitt Romney's rendition of "America the Beautiful" at a campaign event in Florida. Hear him for yourself: