Wynonna_Cactus_230new.jpgWynonna Judd is ready to walk down the aisle once again ... for the third time!

The 47-year-old singer and musician boyfriend Cactus Moser have been dating since 2009. Moser popped the question on Christmas Eve, according to People.

Both are currently on the road ... touring as Wynonna and the Big Noise.

This is Wynonna's third marriage. She was previously married to D.R. Roach for four years and Nashville businessman Arch Kelly III. Kelly and Judd have two children ... Elijah, 17, and Grace, 15.

No wedding date has been set.