They were grinning. Jennifer Garner, who was wearing shoes and sweatpants casually, had a dimple when she looked at John Miller, who was also wearing joggers and a New York Yankees t-shirt.

On April 27, as they strolled down a calm street in Santa Monica, California, talking and laughing away, they appeared to be any other couple relishing a few tender moments of connection on a lazy Saturday morning.

For the intensely private pair, the outing was a rare occasion. According to an exclusive insider who speaks with Life & Style, six years after they initially started dating, Jen and John are “seriously in love” and in a point where they feel “comfortable going out in public more than ever.”

That’s because, after a protracted — and covert — engagement, they’re finally set to walk down the aisle, Life & Style has learnt.