Lamar Odom's alleged third mistress, Sandy Schultz, not only came forward with cheating allegations but also wrote a 12-page letter to the athlete spilling details about their steamy affair, Star magazine reports.

In the extremely graphic letters Schultz says she was only 19-years-old when she first met Odom at the Studio One nightclub in West Hollywood in 2003 well before he met Khloe Kardashian. She also claims the reality stole Odom from her.

"From the first time I seen you at the club when I was 19 years old I was always awed by you," she wrote. "You struck me as someone confident and I loved your openness and sexuality. I really loved you and thought you and I would always be together and even married one day."

According to the alleged mistress the two "dated solidly" for two years and then off and on for seven years.

"I was very much in love with," she told the magazine. "I loved his openness and his sexuality. My nickname for him was 'Lam Lam' and to hear Khloe calling him that now is a dagger through my heart."

She then described how the reality star took her man at a party for Ron Artest. Odom was on the guest list and brought Shultz to the event as his date. Not long after she arrived at the party she claims Kardashian "made a beeline" for her man.

"We were sitting at our table having drinks," she said. "I got up to go the bathroom and when I returned, Khloe had taken my seat next to Lamar. She didn't move, so I sat in his lap."

Schultz said that instead of coming home with her that night, Odom left the party with Kardashian and one month later they were getting married.

In a 2011 interview with Ryan Seacrest, Kardashian dishes on how she met Odom at the party and how she really didn't like him when they were first met.

"I did not like Lamar, I hated him...[I was like] this guy was, 'ugh you're a basketball player, you're typical, you're annoying, I met you at a club,' like everything on my list - I was like ew ewe w," she said.

The reality star told Seacrest that after the party she went out to eat with Odom and some friends and decided he might be a good guy and gave him her number. Something clicked between the two and 20 days after they first met, the athlete proposed and nine days later they were married.

In the letter, Schultz describes how heartbroken she was when Odom left her for the Kardashian.

"I was sooo mad at you for choosing Khloe especially since I was around for years, for choosing Khloe the same day we were together, for never giving us a real chance but then something hit me and I couldn't take you being happy personal," she wrote.

Eventually Schultz and Odom met up again and after spending a night together he left and she never heard from him again. According to a new report by Radar Online, Kardashian knew about the alleged mistresses.

To view the letters click here.