Christine Baumgartner's rocking her engagement ring publicly for the first time since the big yes to Josh Connor ... showing off that shiny new bling as they headed out for a walk.

Peep the pics -- Christine’s ring is sparkling bright as she cozies up to Josh on a romantic stroll, proving she’s in a much better place less than a year after wrapping up her bitter divorce from Kevin Costner.

Josh, who was once a mutual pal of Kevin’s, made it clear once and for all, he’s all Team Christine now, with his arm casually draped around her and hers around his back -- with that fancy ring front and center.

Christine’s living the dream -- she’s not just gonna be a blushing bride again -- but she is still cashing in from her ex, Kevin!

Court docs revealed Kevin’s already forked over a $1 million lump sum to Christine, as per their prenup. But, no matter her new status, we also revealed her child support stays the same -- so he’ll still be shelling out $63K a month for their three kids.

They're sharing the parenting of 17-year-old Cayden, 15-year-old Hayes, and 14-year-old Grace.

Looks like Christine's got the ring -- and everything else -- wrapped up!