The 34-year-old actress revealed she was shoved aside by 18-year-old Kylie's bodyguards after the Opening Ceremony show during New York Fashion Week.
Jessica explained: "I got like body checked. Yeah, and it was like, by two of them. I was like, 'Whoa, whoa! What's happening?'
"I thought there was like a fire. Like, I was like, 'What's going on?'" she recalled. "Um, but I guess someone was just leaving the building."
Kylie added to Andy Cohen on 'Watch What Happens Live': "It was shocking."
The New York Post's Page Six first reported the incident revealing that Jessica looked "astonished" by the actions of Kylie's team.
An insider said: "After the show, trying to leave the venue, it was very crowded. Everyone was in the crush and Jessica had stopped briefly to say hi to someone when all of a sudden from behind came Jenner's bodyguards. They just shoved Jessica out of the way. She just looked astonished!"