Calista Flockhart

We first spotted the newly-engaged Calista Flockhart out and about with her new ring from Harrison Ford on Friday night ...

But yesterday we finally saw the rock!

Mrs. Ford was hiding a whopper of a diamond the other day but Sunday afternoon as she walked with her son Liam in Brentwood, the stunner was a full display.

Hey, a man who gives his ex-wife $90 million in the divorce better give his new girl something good!