Taylor Swift looked like a princess, Jon Bon Jovi strummed his guitar, and Prince William let loose. Together at a fundraiser at Kensington Palace in London, the three joined forces on stage to give a performance of viral proportions.
The video, below, shows the Duke of Cambridge and T-Swizzle providing backup vocals as Bon Jovi sings his 27-year-old rock hit "Livin' on a Prayer" (yes, it was released in 1986, three years before Swift was born). The song recently resurfaced on Billboard's Hot 100 singles chart after a sports fan's lip-syncing antics went viral last month.
See also: Miley Cyrus Leads 'Time' Person of the Year Poll, But Is it Rigged?

The event raised funds for Centrepoint, a charity for the homeless, which live tweeted the sing-a-long:
THIS JUST HAPPENED Jon @BonJovi , @taylorswift13 AND Prince William sing #LivingOnAPrayer at #WinterWhitesGala pic.twitter.com/M1scNUdVo4
— Centrepoint (@centrepointuk) November 26, 2013
Ever charitable, Swift memorably performed last year at the Stand Up to Cancer telethon, debuting an emotional song ("Ronan") about a boy who died of cancer.
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BONUS: Miley Cyrus's Guide to Owning Your 21st Birthday
Do you have a group of friends and a way to procure alcohol? Then you'll be good. Relax.
The right glittery clutch, or grill, could make the difference.
You don't want to wear the dress that slips off or the heels that always catch on tiles, this is not a night for wardrobe malfunctions.
Trying a weird looking drink crazy, not rob a liqueur store crazy.
It should keep you from doing anything too dangerous.
It's your birthday, and you can sparkle if you want to.
It's your birthday and no one can fault you for claiming an afternoon nap.
This is your night, and whether you want it too] look like The Hangover or not is your decision.
Because sometimes the difference between tipsy and drunk is a bag of goldfish.
You're going to have fun, but it probably won't be the best night or your life. But that's good, because you have a lot of birthdays left.
Even if the perfect bar is packed or they're out of your favorite drink, it's going to be ok.
Hey, it works for Miley.
It's very possible you're going to have to trust these people to keep you from making terrible decisions. So ask yourself -- would they let you do it for the vine?
Image: Getty Images