Obama sings ‘Purple Rain’ to trick-or-treater dressed as Prince

WASHINGTON – U.S. President Barack Obama and Michelle Obama welcomed scores of superheroes and princesses to the White House on Monday — and a youngster who dressed up as the president, grey hair and all.

Some 4,000 people visited the White House for the final Halloween celebration of Obama’s presidency. Students from local schools and children from military families dressed up for the occasion. One family also brought their dog, fitted with a lion mane and looking content to play the part.

Obama was recorded singing “Purple Rain” to a young boy dressed as the Prince, the musician who died earlier this year.

Obama also got a kick a out of a trick-or-treater who dressed as a “Lame Duck.”

WATCH: Obama laughs at trick-or-treater’s ‘lame duck’ costume

0:39 Obama laughs at trick-or-treater’s ‘lame duck’ costume

For nearly an hour, the president handed out White House-labeled Hershey Kisses and Michelle Obama handed out cookies on the South Drive.

The president jokingly told some of the youngsters earlier in the East Room that on Halloween, at least, he hoped they didn’t have to pay attention to Michelle about healthy eating.

“Candy for everybody,” she said to applause.

After the trick-or-treating, students dressed as zombies danced to Michael Jackson’s Thriller as the president and first lady looked on and tried out a few dance moves as well.

WATCH: Zombies treat Obama’s to ‘Thriller’ dance on White house lawn

1:47 Zombies treat Obamas to ‘Thriller’ dance on White House lawn

-With files from Global News.