Starring Ben Stiller, Owen Wilson, Patton Oswalt, Jenny Slate, Nick Kroll, Tim Gunn, Christine Taylor, Jerry Stiller, Rashida Jones, Andy Daly, Julie Klausner, Jon Daly, James Adomian, Katy Perry, Leighton Meester, Heidi Klum, Kim & Khloe Kardashian.
It is called Zoolander: Super Model, and it does indeed star the voices of Ben Stiller (as Zoolander) and Owen Wilson (as his best model buddy Hansel).
That is probably because as far as I can tell it was never released in the United States.
I hope this is something we can see in the U.S. someday; I would like to watch more.