Ray J is mourning the loss of his other sex tape partner, Joan Rivers.

The R&B singer joined the legendary comedienne in bed earlier this year, when they spoofed his infamous video with Kim Kardashian for Rivers' WeTV show "Joan & Melissa: Joan Knows Best?" 

"Joan was a hell of a lady! She was fun and exciting," Ray J tells toofab. "Spending time with her was like roller coaster at Magic Mountain! I will really miss her -- rest in heaven."

Ray J also shared some previously unseen behind-the-scenes footage from the shoot with us (above), showing how excited they both were to be working with each other.

Rivers is seen sporting a smile (and extremely long extensions) in another photo from the shoot below, where she and Ray J are pictured with his manager, David Weintraub.


As we previously reported, Rivers passed away last Thursday at the age of 81.

Her funeral was held on Sunday at Manhattan's Temple Emanu-El and was attended by A-list stars like Whoopi Goldberg, Howard Stern, Diane Sawyer, Barbara Walters, Sarah Jessica Parker, Joy Behar and Kathy Griffin.

Click here to see more celebrity tributes to Rivers.