Khloe Kardashian's flashing a massive rock on her left ring finger which might have ya thinking she's engaged to Tristan Thompson ... but don't go buying a gift yet.
Khloe and Tristan had dinner Sunday night at BOA Steakhouse on the Sunset Strip ... and from the look of things, it wasn't the most exciting date night. Khloe seemed to be giving Tristan serious side-eye while he looks at something other than her -- maybe his phone or the menu.
But the bling on her hand was a definite bright spot.