The former couple - who split recently over Chris' feelings for ex-girlfriend Rihanna, even though he is still on probation for beating her up in 2009 - had dinner together at Wokcano in West Hollywood before attending the opening of new store Wild Style.
A source told HollywoodLife.com: ''Chris and Karrueche were seen having dinner Friday night at Wokcano on Third Street in West Hollywood around 10pm. It was weird seeing them together after everything that happened with the two of them and then Rihanna's in the mix too. It's just too crazy. Chris and Karrueche got a quiet little table toward the back of the restaurant and ate together. The pair spent almost an hour together at the restaurant and other diners said they appeared to be having a great time together.
The eyewitness added: ''They were at the restaurant for about 40-45 minutes. They ordered a few sushi rolls and Kae had white wine. They were having a fantastic outing together and it really showed.
''They weren't all touchy feeling with one another, but they were having a great time. There was a lot of smiling at one another. He was telling jokes and being funny and she was eating it up, laughing at his every word and being attentive to him. Not sure if they're back together, but something is definitely up - judging by the way they were interacting.''