During the late night chat, Barlow was asked a series of questions where she had to choose between Shah and their costar Meredith Marks. When Andy Cohen asked her whose marriage would last longer, the businesswoman chose the jewelry designer and her husband, Seth Marks, over the embattled star and husband Coach Sharrieff Shah Sr.
Although she quickly backtracked, saying she believed both unions will stand the test of time, Shah was not happy with her frenemy's response and made it quite clear.
Aside from Shah and Barlow's feud, another scandal in the hit reality show revolved around newbie Jennie Nguyen, who recently came under fire for old racist social media posts and is one of Barlow's good friends. All current cast members have since come out condemning the posts.
Meanwhile, Barlow also revealed during the late night show that after filming the upcoming reunion, she was not feeling close to either Shah nor Marks. "Neither. Can I say neither?" Barlow remarked when asked who she was on good terms with.
After the mother-of-two, who shares sons Omar and Sharrieff Jr. with Sharrieff Sr., discovered Marks hired a private investigator to look into her, she was deeply troubled by Barlow's response given she previously slammed Shah for using a PI in the past.
"How come when we went to Vegas, Lisa, you specifically came to me and said, 'I heard that you are researching all of us,' and you're digging into it," Shah screamed at Barlow before lunging at her and being held back by producers. "And now your best friend of 10 years hires a private investigator to look into me and no one says anything?"