Watch: Obama sings 'Purple Rain' to a little boy dressed as Prince

Best Halloween ever? This family thinks so.

President Barack Obama sang "Purple Rain" to a little boy dressed as Prince for Halloween.

Gary Williams, Jr. posted a video to Instagram of the president singing to his nephew as he went trick-or-treating with thousands of other local kids at the White House Monday.

The little Prince's outfit was complete with a purple coat, a poet shirt, mustache and guitar. William's niece was dressed as a unicorn.

For more from the White House's Halloween festivities, check out the video below.

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