Multiple sources extremely close to the couple tell us, Rihanna and Drake have gone from casually hooking up to seriously dating ... they've decided to give it a serious shot.
We're told Rihanna wants to spend as much time with Drake as her schedule will allow -- because he treats her better than anyone she's ever been with. Not a high bar.
As we reported, the pair have been virtually inseparable while Drake's been touring in Europe -- we're told Rihanna has spent every single night with him since she arrived.
As for Drake, he's smitten -- one source said "he's in the best mood he's been in a long time."
