'Dancing With the Stars': Shawn Johnson says 'offbeat' routines 'mentally shut everybody down'

derek-hough-shawn-johnson-bhangra-dwts.jpgThe "Dancing With the Stars: All-Stars" semi-finalists were definitely assigned some "offbeat" routines this week -- but the most bizarre was probably Shawn Johnson and Derek Hough's "Knight Rider" bhangra.

They earned a perfect 30 score from the judges for their almost indescribable performance, which Shawn told us backstage only came together at the very last minute.

"This has been the week from hell," she said, "I think for the entire cast."

"We were thrown stuff we weren't used to," added the Season 8 champ about the offbeat routines. "At the semifinal, you really want to take this week to show the world what you're capable of, and when you're given a 'Knight Rider' bhangra, that kind of limits you to what your abilities are. And mentally it shut everybody down."

"As of two days ago we didn't have an Argentine tango [their second routine] or a bhangra," Shawn laughed. "So we kind of threw it together -- we choreographed the beginning of both dances at the beginning of today."

They must have done something right, as all three judges raved about their performance.

"I don't know [how we did it]," said Shawn. "I think that's why we were so freaking out at the end, because we were literally expecting to go out there and [bomb]. I'm so proud of what we pulled off."

Find out whether Shawn and Derek are advancing to the finals on the "Dancing With the Stars: All-Stars" results show, Tuesday night at 8 p.m. on ABC.

Photo/Video credit: ABC