In advanced clips sent to ET from the couple's guest appearance on the Steve Harvey show airing Wednesday, the 58-year-old talk show host gets emotional when he tells his daughter that he wasn't expecting all of this to hit him so hard.
Karli jokes to her dad that he has yet to do his "homework" of picking out a song for their father-daughter dance.
"Dad, I love you so much … I really, really appreciate you and I'm not just puttin' on, I love you and I'm so grateful, because you don't have to do this," she says after he reveals he has a perfect song in mind.
That's when you can see the tears begin.
"In all seriousness, I think that Ben is a fine man, I really do," Steve says. "I’m your father, so look, you know my story. I've gotten it wrong a couple of times, you know. I just always set it up for my children that they could get it right and I try to help them pick someone that they could get it right with."
Karli's response is sweet and sincere.
"You’re an amazing dad," she replies. "No matter what. You are an amazing man. I wouldn't trade you for the world. I just love you so much."
Karli and Ben made several appearances on the Steve Harvey show last season, allowing viewers to help them make crucial wedding decisions, like what the cake and invitations should look like, and where their bachelor and bachelorette parties should take place. The couple will be stopping by the show on Wednesday for one final interview before saying 'I Do.' Check your local listings or go to the Steve Harvey show website for time and channel.
This isn't the first time we've seen Steve get emotional. Watch the video below to see his reaction to his family surprising him on his 58th birthday.