Marvel confirms Vin Diesel cast as Groot in 2014's 'Guardians of the Galaxy' directed by James Gunn [PHOTOS]

Although Vin Diesel pretty much announced earlier this year that he would portray the comic book character Groot in the 2014 movie Guardians of the Galaxy, it was never officially confirmed by Marvel until this week. So we can finally say that the Fast and Furious star will officially portray a humanoid tree being that only says one thing in an entire comic book series: "I am Groot!" Diesel even celebrated the official confirmation from Marvel by posting the above photo on his Facebook page!

Read more on Vin Diesel's tease of the Groot role from August of 2013 right HERE!

Diesel (officially) joins the impressive cast of Guardians of the Galaxy including Chris Pratt as Star-Lord, Bradley Cooper voicing Rocket Raccoon, Zoe Saldana as Gamora and Dave Bautista as Drax.

Here is an excerpt from Marvel's confirmation of Vin Diesel's role as Groot in Guardians of the Galaxy:

In the far reaches of the Marvel Cinematic Universe, an unlikely cast of characters including Peter Quill, Gamora, Drax, Groot and Rocket Raccoon must join forces to defeat a cosmic force of epic proportions. Directed by James Gunn, the live-action "Guardians of the Galaxy" will take fans to new corners of the Marvel Universe when it hits theaters August 1, 2014, but in the meantime stay tuned to Marvel.com for the latest news as it breaks, including official casting, first looks and more!

Though you've probably already reacted to the Diesel/Groot news when the rumors were making the rounds, what do you think of this officially confirmed casting news?