WATCH: President Obama sings 'Happy Birthday' to Usher

It's normally celebrities singing to the President but on this occasion it was the other way round.

It was a birthday to remember for singer Usher as he was serenaded by President Barack Obama and the first lady, Michelle Obama.

The event was filmed at the White House, showing the ‘You Make Me Wanna’ star being presented with a small cake with a candle in. The President then started singing 'Happy Birthday' before everyone else joined in.

The singer then shared the moment with all his fans on Facebook.

Watch his reaction below.

(function(d, s, id) { var js, fjs = d.getElementsByTagName(s)0; if (d.getElementById(id)) return; js = d.createElement(s); js.id = id; js.src = "//connect.facebook.net/en_GB/sdk.js#xfbml=1&version=v2.3"; fjs.parentNode.insertBefore(js, fjs);}(document, 'script', 'facebook-jssdk')); > So this really happened the other night...... The President and First Lady sang me Happy Birthday at The White House & I...> > > Posted by

The singer turned 37-years-old on the 14th October 2015.

• The Buzz