In a Facebook Live interview with ET's Brice Sander on Tuesday, the 37-year-old former *NSYNC member and close pal of Kim's mom, Kris Jenner, said he called the 60-year-old momager "immediately" after hearing of the frightening incident.
"Of course they're shaken," Lance says of the famous family. "That's just horrible, horrible. I mean, to be kidnapped and tied up and gagged, that is just awful. So, you wouldn't wish that on your worst enemy."
"I just hope they're able to recover, and I know Kim, that's going to scar you for life," he adds. "I just hope they have someone to talk to. That's just scary. I would never wish that upon anyone."
As for Kris' current mentality, Lance says his good friend went into "mom mode, big time."
"Thank God they were all together in France [for Paris Fashion Week], but yeah, that’s some scary, scary stuff," he says.
Lance, of course, isn't the only Kardashian family friend concerned for their well-being. ET also spoke to singer Babyface during Monday's taping of Dancing With the Stars, who sympathized with the reality stars over the scary incident. Babyface has been friends with the family for years, often going on double dates with Kris and her boyfriend, Corey Gamble.
"Kris is good," Babyface, 57, told ET's Nischelle Turner. "I mean, thank God nothing happened and nothing was major, but that's a frightening thing to go through and, you know, praying for them to get through this because when that kinda stuff happens, it stays with you."
"It's gonna be a minute before they can kinda really get over that," he mused. "I just pray for them and hope they get better."
A source close to the 35-year-old reality star told ET on Tuesday that Kim is "still in shock" after she was woken up and robbed at gunpoint inside the luxury apartment she was staying at in Paris, France, on Sunday. According to the source, Kim is "absolutely traumatized" by the burglary and hasn't been sleeping since it occurred.
"All she kept saying over and over is, 'I have kids. Take anything you want. Please don't kill me. Please don't kill me,'" the source said the mother of two told the robbers, who didn't speak English.