06/08/2011 08:04 am ET | Updated Aug 08, 2011

'Harry Potter' First Screen Test: Daniel Radcliffe, Emma Watson, Rupert Grint In Original Scene (VIDEO)

As the epic, eight episode "Harry Potter" book-to-film series closes in on revealing its final chapter, it's easy to take for granted that its stars, Daniel Radcliffe, Emma Watson and Rupert Grint, are now full-fledged adults. With so many movies, the progression has been so gradual and natural on screen that one almost forgets just how young the three leads were when the film series began.

So here's a reminder.

Warner Bros. has released a video of the three in their very first screen test for "Harry Potter and the Sorcerer's Stone," years ahead of maturation but still nailing down their respective parts. Watson, as Hermoine, is a know it all reading about Nicolas Flamel, while Radcliffe and Grint, as Harry and Ron, shrug in confusion. Even then, it was obvious that they embodied the parts.

Also included is a brief look back at the other films of the series, similar to a recent YouTube user's video called "Through The Pensieve."

As for what's next for the now-grown stars? Radcliffe will be singing at the Tonys in support of his hit role in "How To Succeed in Business," while Watson will take on "The Perks of Being a Wallflower," and, hopefully, get a boyfriend.

"Harry Potter and the Deathly Hallows: Part 2," hits theaters July 15th.