The couple will reportedly tie the knot on August 10, two years to the day the actor proposed on his 41st birthday, after undergoing "months of therapy" to talk through their problems.
A source told Britain's Grazia magazine: "After talking honestly, their issues seemed to evaporate."
"Justin admitted he hated the idea of an over-the-top wedding. Jen's happily agreed to a low-key do with friends and family."
"Jen's thrilled and Justin couldn't be happier."