My how things change so quickly!

On and off again couple Rihanna and Chris Brown, who have went their separate ways once again, took some passive aggressive shots at each other via Twitter over the week.

Rihanna kicked things off when she posted a picture on her Instagram account stating, "If I drop all my hoes for you and we still don't work out you owe me some hoes." Really now!

Chris couldn't help but retaliate when he tweeted, "She's not mine if she's everybody elses."

The former couple's Twitter war comes fresh off the heels of reports claiming Rihanna was partying with her ex, New York Knicks star J.R. Smith while Chris has been linking up with his ex Karreuche Tran.

Things could get interesting if this continues!