Former President Barack Obama has been keeping a relatively low profile since leaving the White House. It's to be expected, of course, as he just spent eight years as the most powerful man in the country, so no one can blame him for wanting to take some time away.

Currently, the father of two is on his annual holiday visit to Hawaii, where he was born. Obama was hosting a Christmas party at the Paul Mitchell estate in lanikai, where he and his family were staying. A women's rights group, the Windward ReSisters, heard that their former president was in town, they decided to stop by.

"We got our group together on Saturday and went with our [...]Santa hats and proceeded to Christmas carol in front of the estate," group member Darlene Mandel said. "We sounded terrible."

The group figured that someone would eventually come out and tell them to stop, but instead, Barack Obama himself emerged from the estate.

According to Mandel, Obama came out with a big smile to greet the group. He shook hands with all of them and even hugged a few members.

"After about 10 minutes, he came out with three Secret Service agents and I was ready with my trusty camera," Mandel says.  "He was joking because my girlfriend spilled champagne on him. It was short and sweet and made our Christmas."

Obama was a great sport about the carolers, even joining in on "We Wish You A Merry Christmas" after realizing the group had been drinking.

"No wonder you're singing so happy; I didn't realize there was champagne to go with it!" he said. "I hope you guys have a wonderful Christmas."

The video was posted on Facebook and went viral almost instantly! People loved seeing the fun side of a former president.

"As far as I know, this is the only informal Christmas greeting he gave this year, besides the Obama family's official card," Mandel says.

Check out the video of Barack Obama meeting the group!