Kathy Hilton broke down in tears while opening up with Jennifer Hudson about meeting her grandson Phoenix.

The Benjamin CaldwellHilton family matriarch sat down alongside daughter Paris to discuss meeting the model and singer's 1-year-old son on "The Jennifer Hudson Show."

After Paris said Phoenix made her life "complete," Hilton broke down in tears with a Kleenex in hand. "Just watching them. So beautiful," Hilton said. Then, Hudson asked where Hilton adopted the nickname "KiKi" from Phoenix, and the former "Real Housewives of Beverly Hills" star had a sweet response.

"My sisters when they couldn't say Kathy," Hilton said. Hilton's sisters are actress and television personality Kyle Richards and "Housewives" alum Kim Richards.

More:Kyle Richards tears up speaking about Mauricio Umansky split: 'Not my idea of my fairytale'

Paris famously surprised her family and the world with news that she had welcomed Phoenix via surrogate.

"Paris is always surprising I think all of us … she had these other like gifts for me because it had just been I think Valentine's or Christmas and she'd been working so she came out and my husband had just lost his dog that was like our child, so I thought it's either a new puppy or a monkey," Hilton said. 

"I was really nervous because just to surprise someone with something like that was quite the surprise like because my mom said I am full of surprises, but that was on another level,” Paris said during the interview. 

Common announces relationship with Jennifer Hudson on talk show

Hilton's not the only celebrity making news on Hudson's talk show.

On Monday, Common appeared as a guest on the show, where he discussed his love life. Rumors have swirled for months that the Grammy award-winning rapper, 51, is dating the EGOT winner, 42.

In the episode, Hudson playfully pressed Common, who arrived with flowers for her and said he loves "being in your presence," to talk about his dating life.

"Let's get down to business, Mr. Common. I'm a host, and so I have to ask you this question because everybody always wants to know this. Are you dating anyone?" Hudson said.