PHOTOS: Rebel Wilson shows off her INCREDIBLE weight loss transformation on Instagram

Rebel Wilson has debuted her INCREDIBLE weight loss transformation by posting a pic on Instagram.

The 36-year-old Pitch Perfect actress proudly showed off her 3.6kg weight loss she achieved in just 4 DAYS due to a hiking trip in the states.

She captioned the photo: "OMG just finished 4 fantastic days at #TheRanch4.0... so challenging but very rewarding!"

"Not to mention I lost 8 pounds from marathon hiking over the 4 days! Thanks to the amazing staff and masseuses (free daily massages (free daily massages are part of the program)!! Feeling great!!"

Check out all the pics above!

[Photos: Getty/Instagram]