The actress, 43, gushed about her beau, 40, while promoting their new film Wanderlust in the Australian issue of Marie Claire magazine.
'He's a protector, for sure,' she tells the publication. 'He's just a good human being, and so funny.'
The pair first fell in love while making Wanderlust in rural Georgia in 2010 and Aniston paints it as a blissful time for her.
She 'began decompressing' while on the secluded set.
She added: 'It's weird, but it felt like living a normal life; almost like having your anonymity back. Nobody bothered us and we were protected as a group.'
The former Friends star also spoke about filming topless scenes for Wanderlust, which disappointed at the US box office earlier this year.
'There are always nerves when you shoot a scene like that,' she admitted. 'But the adrenaline takes you through it and then you have the girls come in and cover you up immediately.'
Jennifer and Justin are currently living together in a Hollywood Hills rental home after a stint in New York and are gearing up to move into a huge $21 million home in Bel Air.
Next up, Jennifer is rumoured to be starring in 'warped vacation' film We're The Millers.
The comedy actress will appear alongside Jason Sudeikis in the road movie about a drug dealer who creates a fake family so he can smuggle a huge quantity of marijuana across the US.
Rawson Thurber, who directed Dodgeball, will helm the project, which has been written by Wedding Crasher creators Bob Fisher and Steve Faber.
