Chris Brown and Rihanna, whose romance had a spectacularly violent and public flame-out in 2009, appear to be hooking up again -- at least on Twitter.Brown and Rihanna's relationship came to a very public end when Brown was arrested on domestic assault charges after an incident with Rihanna, which left her with visible injuries on her face and body. Brown later pleaded guilty to a felony and accepted a plea deal of community service and five years' formal probation. Rihanna has since said she's still a Chris Brown fan. The singers sent a few public tweets Thursday that seemed to have very specific audiences. At 4:06 p.m., Brown, who follows Rihanna on Twitter and vice-versa, tweeted, "Love U more than u know!" A minute later, Rihanna tweeted, "I'll always love u #1LOVE. "On Dec. 15, Chris Brown's mother, Joyce Hawkins, tweeted, "HELLO LADY I MISS YOU AND LOVE YOU!!!!! YOU KNOW WHO YOU ARE!!!!"

 The two exchanged some interesting, and mysteriously coincidental tweets on Dec. 29.

 First tweeted by chris brown:

Rihanna "responded" by saying: