If you're the best man at a wedding, your responsibilities include throwing a kick ass bachelor party, not losing the rings, making sure the groom actually shows up and being the biggest party animal at the reception afterward.
Prince Harry did all of the above for now-married brother William.
William may have made it to the altar first, but it was Harry and girlfriend Chelsy Davy who kept the Royal Wedding party going until the wee hours.
In fact, Chelsy Davy and Prince Harry stayed out reveling until sunrise at an after party long after the reception shut down. That's just how they roll!
Harry and Chelsy continued the festivities at the Goring Hotel after the official reception wrapped at Buckingham Palace, according to news reports.
The hotel bar reportedly even ran out of Kronenbourg beer before the fun-loving twosome called it a night around 5 a.m. Impressive performance!
The youngest royal made it his personal duty to ensure all the guests had an amazing time and plenty of alcohol - with Chelsy his right-hand gal.
"He wanted to make sure everyone had a brilliant time," says a source.
"He was acting like a rock star the whole night, and making sure all the girls had a cocktail and all the lads were trying the Sambuca shots."
While Prince Harry and Pippa Middleton look cute in photos, it sounds like things are going well between William's brother and his longtime GF.
Don't forget to invite THG to your wedding in a few years, kids.