The Mean Girls actress revealed to The Sun that she allegedly turned down the boy band singer after he came to her hotel room unannounced.
"I didn't know it was him," she said explaining that Styles, 22, had knocked on her door at 2am. "He was in a suit. I said, 'Well, you're very good-looking – can I help you?' That was it."
PEOPLE has reached out to Styles' reps for comment.
Lohan, 29, claims she didn't recognize who he was, despite him giving his first name, and politely closed the door on him. "He was like, 'I'm Harry. Gavin and Michael sent me here.' I was in bed. I was like, 'I'm going to bed but it was nice to meet you,'" she explained, adding, "It was 2am, I had just come back from an AA meeting. I looked like s--- too. I was wearing a big hotel robe, I had a slip under it. It was not a good look."
It wasn't until she told her sister that she realized who exactly she turned away.
"It didn't click who he was at the time," Lohan said. "I told my sister the next day and she was like, 'Wait, are you kidding me? Do you understand? Do you have his number? Can I have it?'"
Now, Lohan can probably let go of the idea of the One Direction crooner showing up unannounced ever again. "I saw him in LA recently. I think it's probably awkward on both our parts now," she said.
But as of late, the actress has a new man in her life. Lohan confirmed she is dating Russian business heir Egor Tarabasov telling the publication: "I haven't known Egor for that long. We've been together for about seven months. He is a great guy. I met him in the summer. I'm really happy."