RiRi has a Twitter war with model Karrueche Tran
The You Da One singer - who dated Chris until he assaulted her in February 2009 - appears to have been sending a series of subtle insults at his current girlfriend, Vietnamese model Karrueche Tran.
Earlier this week, she tweeted a photo of a bag of rice cakes wearing sunglasses and with gold earrings, with the caption, "Ima a make u my *****," which many have interpreted as a jibe at Karrueche.
When a follower then tweeted "@rihanna save me some rice cakes rather hungry," she hit back with the comment: "Kinda DRY tho."
Karrueche is then said to have replied via posts on Facebook, writing: "Let me clear the air, if you have fenty at the end of ya name or your default Is Rihanna you have a better chance of winning the lottery than ending up on my friends list."
However, the model has since denied she has a Facebook page.
This hasn't stopped Rihanna, who continued to post messages on Twitter last night writing lyrics from a Lil Kim and Mobb Deep's track, reading: "I'm a leader, yall on some followin ****... coming in dis game on some modelling ****."
Although they split in 2009, recently Rihanna and Chris have been seen at a number of the same events, and he appeared on a explicit remix of her track Birthday Cake.
A source told Us Weekly: "Rihanna loves to live dangerously, and talking to and hooking up with Chris is all part of that."
Rihanna recently told TV host Jonathan Ross she misses being in a relationship, saying: "You want to share your life with someone. That's what I'm missing right now."