The singer says Otunga made this request because he wanted proof she was dating a producer - which she denies doing.
She says the incident was witnessed by their son, an assistant, and a makeup artist.
The Veep actress, 56, shared a video on Instagram on Thursday, January 11, that her sons Henry and Charlie recorded for her in honor of her last day of chemotherapy.
Jennifer Hudson has alleged her former fiance David Otunga physically abused her in front of their young son.
The singer also claims the professional wrestler left out guns to intimidate her - after her mother, brother and seven-year-old nephew were murdered by her sister's estranged husband in 2008.
Hudson says the incident was just the latest to occur as part of a pattern of escalating and threatening behavior, according to TMZ.
A domestic battery investigation has been opened up and it has been classified as a misdemeanor, police told the website.
She also says in the petition she's been 'solely responsible for making all major decisions' for their son, though sources say Otunga claims it's 'exactly the opposite', according to TMZ.