Rob Kardashian is headed back to the gym.
The E! star generated a Twitter frenzy two weeks ago after being photographed noticeably heavier en route to sister Kim Kardashian's wedding festivities in France. Since, Rob has taken to social media to defend himself, and is now turning to celebrity trainer Gunnar Peterson (who has worked with Sofia Vergara, Angelina Jolie and Jennifer Lopez) for some help with his workouts. E! News got the exclusive from the fitness guru (who also works with Khloe Kardashian) on his plan to get the 27-year-old back into tip-top shape.