Robert Pattinson and Suki Waterhouse seem to have more than just a baby on the way -- there may even be wedding bells in the near future ... if this ring is any indication.
The couple was strolling in London Monday and Suki flashed a massive diamond rock on THAT finger. They both seemed pretty giddy as they walked along in the brisk UK weather. If they are, in fact, engaged ... we suppose they have every reason to be stoked!
Suki revealed their pregnancy news late last month during a performance in Mexico ... where she casually dropped the fact she had a bun in the oven -- pointing out her obvious body changes. Since then, she and Rob have been out and about a lot in NYC.
Now, it looks like they're going the traditional route for their family ... via (possible) marriage.