Khloe Kardashian Wearing Lamar Odom Wedding Ring After Sad Anniversary: Picture By Nivel

What exactly is going on, Khloe? On Monday, Sept. 30, Khloe Kardashian headed to lunch at Stanley's in L.A. with her mom Kris Jenner. The reality star, 29, didn't crack a smile for the outing -- but she was rocking, for reasons yet unknown, her marital bling. Confusingly, Khloe wore the giant wedding and engagement ring from very-estranged husband Lamar Odom. A few days earlier, on Sept. 27, she and the troubled NBA free agent, 33, spent their fourth wedding anniversary apart. She also dropped "Odom" from her Twitter display name.

Kim and Kourtney's younger sister was spotted hitting the gym solo on the actual anniversary date, and over the weekend she revealed a crystal heart given to her by . . . close girlfriends Malika and Khadijah Haqq.

She and Odom are through, pals told Us Weekly recently. "She'll be the one who ends things, and it will be soon."

Late last week, Odom resurfaced on Twitter to actually defend his estranged in-laws as he slammed his father, Joe Odom, for blasting the Kardashians in the press.

"Won't continue 2 speak on this but I have got 2 let this out real quick," Odom (said to be battling substance abuse problems) wrote. "I have let this man and many other get away with a lot of sh-t. He wasn't there 2 raise me. He was absent ALL of my life due to his own demons. My mother and grandmother raised me. Queens raised me."