'Remorseful' Brown 'extremely grateful' to be back with Riri

Chris Brown won Rihanna back by showing her how "remorseful" he is.

The R&B star - who is still on probation for beating his girlfriend in 2009 - is "extremely grateful" that the 25-year-old 'Stay' singer took him back recently and says that the incident made him realise he could "lose it all".