Karrueche Tran may have been wearing that big ole diamond on her middle finger when we spotted her leaving Cecconi's on Tuesday -- but she's not fooling anybody -- that's clearly an engagement ring!

While the couple has not officially confirmed their engagement, there's been a lot of speculation about the betrothal ever since Karrueche flashed an Instagram of two diamond sparklers on Christmas day.

We think Chris tried to win back his on-again/off-again girlfriend over the holidays with some major ice. Chris may not be a good boyfriend but luckily for the felon -- diamonds are a girls best friend! Apparently even when you call out your girlfriend on social media and publicly slam her -- you can be forgiven and all can be healed with the help of some major bling.

Meanwhile, Chris has reportedly cancelled his future nightclub shows because he thinks they're "too hood" after five people were shot and injured during his gig in San Jose, California on Sunday.