I am surprised no one has commented on this.
Lena's face looks almost like Molly Quinn's face (the red headed daughter on "Castle") In fact, the first time I saw Lena I thought Molly Quinn has changed her hair and started doing porn.
The dead give away is their hair and bodies are nothing alike, but damn their faces almost make them seem like sisters.
Don't have time to find the best set of photos, but I think this pair of photos show close enough resemblance to make my point. I think the similarity between their faces is more easily noticed when you see them both in motion.