Emmy winner John Larroquette has been tapped to star opposite Annaleigh Ashford in ABC's Three Rivers single-camera comedy pilot, from I Hate My Teenage Daughter creators Sherry Bilsing-Graham and Ellen Kreamer and ABC Studios. Written and executive produced by Bilsing-Graham and Kreamer and directed by Tristram Shapeero, Three Rivers centers on Rebecca Watts (Ashford), who left her family's Texas ranch years ago to work at an upscale hotel in New York, but after being…