Ciara & Russell Wilson: ENGAGED ... One Step Closer to Sex!

Russell Wilson finally put a ring on it ... A HUUUUUGE RING ... proposing to Ciara with a stone the size of a baby's fist.

The Seattle Seahawks QB popped the question during a private champagne dinner off the coast of Africa on an island in the Seychelles ... paving the way for him to finally bang the pop star.

As you know, the extremely religious couple took a vow of celibacy ... promising to keep their hands off each other until they get married.

Almost there, brother ... almost.