Jennifer Richardson, the woman who claims she had a yearlong affair with NBA player Lamar Odom, has spoken out about their tryst on camera.

Richardson explained in a video interview -- filmed exclusively by Star magazine -- why she agreed to have a threesome with Odom, who is married with Keeping Up With The Kardashians star Khloe Kardashian.

Richardson said she fulfilled Odom's request to have a kinky romp that included another woman on Christmas Eve in 2012.

In the video below, Richardson reveals that she convinced a BFF to join her and Odom in a bedroom.

"The girl that I chose is a friend of mine," Richardson says in the clip. "It took a little coercing. She wasn't really into it at first, but she knew how much I loved him and cared about him and how much I wanted to make him happy."

She said everyone agreed to it because they were in the holiday spirit.

"Being Christmas..I think everybody was in the Christmas spirit," she said.

Richardson said she knows that Kardashian knows her husband cheated on her, but she is in denial. The alleged mistress said the reality star is willing to work through Odom's cheating because she doesn't want to be the "not-so-perfect sister."

"You know when your man is not with you anymore," Richardson tells the camera. "When he's mentally, physically and emotionally somewhere else."

Richardson also said the youngest Kardashian sister is "caught up in the NBA marriage, the reality TV marriage, fell in love and married in 30 days."

"She has to put up a front that everything is ok," she added.

Richardson said her only advice for Khloe is to "get a divorce."

Richardson first told Star, in the print edition which was on newsstands last week, that she first met Odom at the Stadium Club in Washington D.C. in January, 2012. She said they slept together at hotels in various states, and she attended his basketball games when he played for the Los Angeles Clippers. Richardson said after she told Lamar in February that she was considering ending the affair because they were "growing [too] close," the professional basketball star told her he wanted to have a child with her. She severed ties with him in March.

Odom wed Kardashian in a lavish affair in September 2009 after one month of dating. Their wedding was televised for an E! special. They later had their own reality show Khloe & Lamar on E! for several seasons. Odom has two children with his ex-wife and childhood sweetheart Liz Morales.

Watch Lamar Odom's alleged mistress Jennifer Richardson below.