Katherine Pierce (Nina Dobrev) is a riddle wrapped in a mystery inside a molar-losing enigma on this season of The Vampire Diaries. Does this cold-hearted former vamp feel? According to Nina, she does. The TVD actress told E! Online that Katherine loves one of the Salvatore brothers. But which one is it?

"Of course, there is that lingering love for one of the brothers that we learn more about as episodes progress," Nina said. "But she does love one of the brothers…and we see that unfold." Aww. One of our favorite storylines this season has been watching Katherine deal with humanity and vulnerability and, you know, actual emotions. We’re totally on board with a Katherine/Salvatore brother romantic storyline — even if it is unrequited for now.

The big question is, of course, which brother is it? Our first instinct is to say Stefan, as Katherine has shown more interest in him in the past. She totally could have been with Damon, who remained in love with her for over a century, but rebuked his advances for the other Salvatore.

On the other hand, Elena’s transition from human to vampire changed how she felt about the Salvatores. As a vampire, she fell in love with Damon and out of love with Stefan. Perhaps the same has happened for Katherine? Now that she is human again, is she changed enough to finally value Damon over Stefan. Considering he just tried to kill her, perhaps not…

There is also the doppelganger angle to consider. According to Tessa, the doppelgangers of Silas and Amara always find one another and fall in love. It is inevitable (aka what the universe wants). If this is true, will Katherine always be pulled towards Stefan in the same way Elena is? Seems we are short one doppelganger for this romantic web to work out.

Which doppelganger do you think Katherine loves? Sound off in the comments below!

The Vampire Diaries airs on Thursdays at 8 p.m. ET on The CW.