Justin Bieber Instagram: Selena Gomez's Ex Falls Down Stairs, Shows-Off 'Epic' Injuries on Twitter, Makes Fun of Clumsy Self in Instagram VIDEO

Justin Bieber recently discovered one of Instagram's new hidden wonders... users can now make and share videos on the popular social networking website! And on Sunday (June 23), Selena Gomez's ex tripped down the stairs and scratched himself up before a big photo-shoot. So what does the Biebs do? Show-off his "epic" injuries on Twitter and Instagram, of course! Check out the short clip below... it looks like the clumsy 19-year-old "Believe" crooner scuffed-up his neck pretty good.

Here's Biebers FIRST EVER Instagram video posted on Thursday, June 20... the pop megastar's a little too giggly, isn't he? Some fans suggest he was totally blazed... what do Mstars readers think?

Anyway, here's a rather innocent clip, where Bieber admits "I decided I was gonna fall down the stairs... So I did! Haha."

How many Beliebers would LOVE to treat the "Beauty and the Beat" singer's wounds?

justinbieber: "#whyigottafallandcutmyneckbeforeaphotoshoot, fun."  

Bieber also tweeted:

@justinbieber: "If u didn't hear I fell down the stairs this morning. Check my Instagram for details. It was epic :) lol."

At least the Biebs manages to laugh-off his minor injuries! Silly guy.