Yeah apparently this girl Courtenay Semel is now claiming she had a fling with Lindsay Lohan for a while, before Lindz was with Samantha Ronson…

In fact, this chick claims Lindsay said Samantha is the FATHER SHE NEVER HAD!!!

They met at a club in 2006 and started hooking up, partying, and doing drugs together.  According to friends of this Courtenay chick, she was seeing Lindsay while she was in rehab – on alternating days with Samantha – so that Lindz could string them both along.

She also says Lindsay confided in her that she was confused about her feelings for women and was afraid that if she came out her career would be over… so instead she slept with a ton of guys and did a lot of drugs and partying.

Click here to read the whole story!