Chris and Rihanna have let bygones be bygones.  They officially are back on speaking terms.  Rihanna was busy celebrating her 24th birthday in London when her former boo ~ Breezy wished her a Happy Birthday.

"Happy Birthday Robyn", he reportedly tweeted using the singer's real name.

Thanks! she tweeted back.

Oh and the friendly back and forths don't stop there.  FH has learned that Rihanna asked her former beau to appear on her latest single "Birthday Cake" and guess what?  He graciously agreed!

Hmm...wondering how Breezy's new boo Kai is feeling about all this...I'm sure we'll find out soon enough.