For the first time since announcing her divorce from Kris Humphries, Kardashian joined the family cheering section at Dancing with the Stars to support her brother Rob in the show's finals Monday night.
Kim and mom Kris Jenner wore matching black tuxedos as Rob – in a charcoal suit and pink tie – delivered a smooth waltz with partner Cheryl Burke that impressed the judges.
With the family – including sister Khloé Kardashian and stepdad Bruce Jenner – in the front row, Rob collected a set of nines for a total of 27 out of 30 points in the first round of competition.
But it was his freestyle with Burke that really wowed – and earned them a perfect score for the most important routine of the season.
"To get a 10 you have to really blow us away," judge Carrie Ann Inaba said. "Consider me blown."
Kardashian was beaming over the accomplishment. "Never would I ever have thought I would get a perfect score," he said.