Depends on what you consider "dating". He hangs out with different girls a lot, but imo it's just that, hanging out/spending time with someone. It might be getting serious with Sofia, considering PDA, especially cuddling and holding hands
Ironically, I was just reading up on Nicole Richie's bio and then Lionel's. I read that he had other kids so I searched her up to see if anyone cared for her, and I come on here and see this thread.