Dancing with the Stars Judges "Blown" Away by Rob Kardashian's "Brilliant" Freestyle

Why was Kim Kardashian grinning from ear to ear on Monday?

She couldn't have been prouder of her baby brother Rob's perfect scores for his freestyle on Dancing with the Stars! 

Rob, 24, and Cheryl Burke wowed the judges and ended up at the top of the leader board. "This competition is often won or lost in the freestyle," said Carrie Ann Inaba. "But to get a 10, you have to blow us away. Consider me blown!"

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Len Goodman agreed, telling the reality star, "Rob, you've given your all. You should be proud. Your family should be proud."

From the looks of it, the Kardashian crew certainly was impressed by Rob's progress on the dance floor. Donning matching sparkly tuxes, Kim, 31, Kourtney, Khloe and Kendall jumped up and down excitedly as the crowd cheered for their brother. Kris and Bruce Jenner were also in the audience rooting for the USC grad, as well as Kourtney's boyfriend Scott Disick.

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Rob's first performance of the night was the waltz, which earned him a 9 out of 10 from each judge. "You're like the male version of Cinderella who made it to the ball, and deservedly so," Inaba, 43, said.

Goodman, 67, praised Rob's "good posture," and said the dance "was simple, but it was simply beautiful."

VIDEO: Carrie Ann declares Rob is "the best Kardashian"

Ricki Lake, who earned a perfect score last week on DWTS, also earned all 9's for her cha cha and all 9's for her freestyle with Derek Hough. "We're very, very happy," she said. "I'm thrilled!"

J.R. Martinez suffered an injury last week, but the 28-year-old and partner Karina Smirnoff gave their all Monday during their cha cha and freestyle performances. The judges weren't in agreement on their first dance; the veteran and actor earned a 7 from Goodman, an 8 from Inaba and a 9 from Bruno Tonioli.

One thing the judges could agree on, however, was Martinez's freestyle. "Those were the sickest lifts I've ever seen!" Inaba exclaimed. "Karina, I'm glad you're safe!"

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Goodman agreed, telling Martinez and Smirnoff their performance revealed two things: "Karina's body and [J.R.'s] talent!"

On Tuesday's show, season 13's Mirror Ball Trophy will be awarded to the star with the highest combination of judges' scores and viewers' votes.

Tell Us: Should Rob, Ricki or J.R. win DWTS?