Rihanna is embroiled in a War Of Words with Chris Brown's girlfriend.

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 bitch,'' 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. (sic)''

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 (07.03.12) writing lyrics from a Lil Kim and Mobb Deep's track, reading: ''I'm a leader, yall on some followin s**t ... coming in dis game on some modelling s**t.''

Although they split in 2009, recently Rihanna and Chris have been seen at a number of the same events, and he appeared on a sexually explicit remix of her track 'Birthday Cake'.

A source told Us Weekly magazine: ''Rihanna loves to live dangerously, and talking to and hooking up with Chris is all part of that.''

Rihanna recently told UK 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.''