Lindsay Lohan is back partying and dating in the Big Apple after spending the court-ordered 90 day stint.

The "Mean Girls" star sat down with Oprah Winfrey during an interview and guest-hosted an episode of "Chelsea Lately" after days of being released from rehab.

The actress is definitely back to the party scene as she was spotted last Saturday night for New York Fashion Week at a new club called Raven. The 27 year-old star is not alone as she showed up around 2:30 am with a man she was calling her new boyfriend.

But who is this mystery man? Rumors have leaked that Lindsay was dating a guy back when she was in rehab but he got kicked out, since sexual relations are against the rules during treatment.

According to a Cliffside inside, "Prior to Lindsay's arrival, I was roommates with the guy who ended up dating her. When she came, the first or second day they ended up kissing and it was on from there. The guy was actually dating someone else in rehab at the time and Lindsay told him he needed to get rid of that other girl and be with her only. She was really territorial with him."

The guy's room mate confirmed that they are still together right after Lindsay's hit the Malibu ground. "They're still together now. They go to meetings outside and she meets him there. She still talks to him every day. The guy was nice to her, but it was fake. He would talk sh*t about her behind her back. Lindsay basically bought his affection."

Could this be the same guy that she was dating in New York? Whoever he is, hopefully he is not taking advantage of Lindsay's celebrity status and won't affect her chance of staying clean now that she is back in New York with a new apartment.

According to a source close to the actress, "She is going to live alone and she doesn't want anyone else in the place with her. Lindsay wanted to see her sober coach, get her stuff out of storage and finish up a few business meetings."