Random thing 1: Sofia Vergara, Joe Manganiello and Arnold Schwarzenegger all hung out together on New Year's Eve. Random thing 2: They went took in a Britney Spears performance!
We're on the fence about which thing is more random -- but yeah, the 3 celebs and Arnold's gf Heather Milligan ... hit up Planet Hollywood in Las Vegas for a steak dinner, and Britney's "Piece of Me" show.
Sofia still managed to keep that engagement ring (rumored to be 10 carats) under wraps -- just like she did in Hawaii right after Joe gave it to her.
What's impossible to hide is -- this is the most ridiculously fit double date ever. Joe and Ahnald at the same table? That's a ton o' tickets to the gun show, son.