The actor told Zap2It that his character Liam will start getting closer to Annie (Shenae Grimes).
"The Annie situation is definitely getting hotter," he said. "We actually kind of share our first kiss coming up - I think maybe episode two or something like that.
"But then that kind of becomes complicated, as everything on 90210 is. There's another dude who comes in that's actually going to be my half-brother and there's a weird love triangle there. So it's kind of getting hotter with Annie. [And] you never know if things are done with Naomi... so who knows."
Lanter also joked that he does not know whether any of the female characters will fight over Liam this season.
"I don't know," he said. "I hope so - it's kind of cool, right? Actually, I don't know if there's going to be a physical fight but from what I hear, in some upcoming scripts there might be a couple of girls fighting over me."
90210 returns on September 13 on The CW.