The pair - who live together in Los Angeles - have been dating since 2010 and are said to have plans to tie the knot near the blonde beauty's parents home town in south west England.
A source told Yahoo Celebrity: ''They're getting married this summer, it'll be a country wedding where Rosie grew up in Devon, close to her parents' farm.
''They've finally set a date and both agreed England should be where they wed, despite their closest friends living in LA.''
The pair split last September for a short period but it seems the Hollywood hunk is ready to fully commit to her since he knows how important marriage is to her.
The source added: ''Rosie and Jason have had a few problems lately but they've come through because Jason finally understand how important it is for her that they tie the knot.
''Jason has always been reluctant, but Rosie's ready to become a mother and she wants to be married before they have a family.''
Rosie recently revealed she's got ''exciting'' times coming up in her personal life but was keen to stay tight lipped about details.
She explained to The Times newspaper: ''Well, a few things in my personal life [are coming up in the future] that are very exciting that I probably can't elaborate on. And very exciting work things.''
She also implied that motherhood could be on the horizon and claims it's a role she's looks ''forward to''.
When asked if she's planning for a baby right now, she replied: ''Maybe. I look forward to the many things that come with being a woman, having children, motherhood, and all of that.''
Steven Tyler prays for Chris Cornell during Asia show.
'Pirates of the Caribbean' is an exciting new career development for Brenton Thwaites.
The actor didn't want to be "wolfy".
Tragedy strikes in Manchester
Leave it to a veteran to show the young sparks how to do it: it's...
The world is messed up. Years after multiple calamities totally trashed the planet, the world...
Mad Max just keeps on running. With nothing else to lose in his life, his...
With the world first running out of oil, water soon followed. Planet Earth is now...
Max Rockatansky is a formidable traveller of the Australian outback, still fighting against the dystopian...
With his usual disregard for story logic, Bay plunges us into another deafening metal-against-metal smackdown....