Nikki Bella was seen for the first time since Artem Chigvintsev's domestic violence arrest ... and her bare ring finger speaks volumes about the state of their marriage.
The former WWE star was just spotted in Oakland, boarding a private plane with a gal pal ... likely headed to Las Vegas where cohosting Netflix's live hotdog eating competition, "Chestnut vs. Kobayashi: Unfinished Beef" Monday.
NO RING BACKGRID
Bella hopped on the plane with a big grin, hat pulled low over her eyes .