Playboy Playmate Kennedy Summers -- Another Fishy Night (PHOTOS)

Playboy Playmate Kennedy Summers chowed down on sushi Friday night at Nobu with a girlfriend ... which is how she rolls after breaking up with NBA player Jeff Withey.

Kennedy went crazy on Instagram this week after learning Withey told her he was going to the movies alone but ended up buying 2 tickets. She accused him of cheating and wrote a post pretending to be a contrite Withey confessing to cheating.

The Utah Jazz center flatly denied cheating on her, saying he bought a ticket for a person in the movie line in front of him.