Chris Pratt, the 34-year-old actor who has bagged himself some pretty tasty roles in recent years, is bulking up for his role in the upcoming Guardians of the Galaxy movie. Pratt is the latest movie star to undergo a dramatic physical transformation and posted his progress in an Instragram photo this week.

It's not the first time the Parks and Recreation actor has changed weight for a movie role - he sported a hugely toned physique for his role as a member of Seal Team Six in Kathyn Bigelow's Osama Bin Laden movie 'Zero Dark Thirty' last year.

Continue reading: Guardians Of The Galaxy: Is Chris Pratt The Next Big Hollywood Star?