Brown got the ball rolling by tweeting: "Love U more than u know!"
Which was followed two minutes later by Ri-Ri tweeting: "I'll always love u #1LOVE".
There was no direct link between the tweets and no other context for them, but celebwatchers have put two and two together and the web is now buzzing with speculation that they have either reconciled already or are about to.
You will remember of course that they split up in 2009 after Brown violently assaulted Rihanna - a crime for which he was convicted and sentenced to five years of probation and six months of community service.
Earlier this year Rihanna relaxed the conditions of a restraining order against him.
Watch MTV News on the hour every hour on MTV - Sky Channel 126 and Virgin Channel 134