Owen Wilson is joining Julia Roberts and Jacob Tremblay in the Wonder cast In development for some time, Lionsgate is moving forward with their feature film adaptation of R.J. Palacio‘s bestselling novel, Wonder. The Hollywood Reporter today brings word that Owen Wilson is set to join the Wonder cast opposite Julia Roberts and Jacob Tremblay, the nine year old star who recently received acclaim for his performance opposite Brie Larson in Lenny Abrahamson’s Room. Wonder, released in February 2012, is officially described as follows: August (Auggie) Pullman was born with a facial deformity that prevented him from going to a mainstream schooluntil now.