Wonder is a 2017 American drama film directed by Stephen Chbosky and written by Jack Thorne, Steve Conrad, and Chbosky, based on the 2012 novel of the same name by R.J. Palacio. The film stars Julia Roberts, Owen Wilson, and Jacob Tremblay, and follows a child with Treacher Collins syndrome trying to fit in. Wonder was released in the United States on November 17, 2017, by Lionsgate and has grossed over $200 million worldwide on a $10 million budget.

Based on this passage, who is the star of the movie wonder? Let's think fast. Stream of consciousness:
The relevant sentence in the passage is: The film stars Julia Roberts, Owen Wilson, and Jacob Tremblay, and follows a child with Treacher Collins syndrome trying to fit in. So the final answer is Julia Roberts.