He put a ring on it!

Diddy proposed to longtime girlfriend Cassie, and we're not sure if he was joking or not, but it seems as if he may have popped the question on Instagram!

The hip hop mogul shared a picture of a gigantic rock and asked if his lady love approved.

"Baby do you like it? I just want to get you wat you Like! I just wanna Mk you smile:) #takeDat.!" he captioned the snapshot.

Hours later, the brunette beauty was seen wearing a strikingly similar bauble in a photo shared by pal Keyshia Cole.

The couple have been dating since 2007.

Congrats lovebirds!