Rebel Wilson divulges the 'a**hole' co-star whom she dedicates an entire chapter to in her new memoir on Instagram. The actress says her book, 'Rebel Rising,' details Sacha Baron Cohen's alleged on-set harassment while they filmed their 2016 comedy, 'The Brothers Grimsby.' In a statement, Cohen's rep tells ET in part, 'While we appreciate the importance of speaking out, these demonstrably false claims are directly contradicted by extensive detailed evidence.' Rebel states in her post that she 'will not be bullied or silenced' in the lead up to her book's release on April 2.