Karrueche Tran, Chris Brown Toy Drive [UPDATE]: Rihanna called 'a wack b*tch,' Chris tweeted about 'Loyal' single from rehab

Karrueche Tran is getting ready for her toy drive with Chris Brown this weekend and rubbing it in to all her haters and... even Rihanna. Karrueche tweeted, "You a wack bitch and you know it."

Chris Brown and his on-and-off girlfriend will be skipping rehab this weekend for a toy drive charity event with Tran. The fashionista posted a flyer on her Instagram page that promised fans to meet the R&B singer.

The first annual Xmas Toy Drive is being held this Sunday at Melrose Avenue.

In other news, Brown tweeted, "CHRIS BROWN's "LOYAL" on iTunes," to support his latest single and hasn't said a word about leaving rehab for the reported toy drive, but chances are since it is a charity event and the singer is working on his anger management problems, a good deed during the holidays may help the troubled artists treatment and image.