Nancy Grace pulled out all the stops last night on "Dancing with the Stars" -- but even with a cartwheel in her jive routine, the TV host still got the lowest score of the evening!

Nancy's tango with partner Tristan McManus only nabbed the couple 24 points -- and they didn't fare any better "instant" jive, which included said cartwheel. The second dance only got them a 20 -- the lowest score of the evening!

It wasn't bad news for everybody though -- as one dancer got a perfect score ... twice!

J.R. Martinez and partner Karina Smirnoff got 30s for both their waltz and jive and got two standing ovations in the process. Watch their perfect dance above!

As for the rest of the crew:

-Ricki Lake and Derek Hough got 28 for their waltz and 24 for their jive. Total: 52.
-Hope Solo and Maksim Chmerkovskiy got 27 for the quickstep and 25 for the jive. Total: 52.
-Rob Kardashion and Cheryl Burke for 27 for their quickstep and 24 for the jive. Total: 51.

Looks like it may be Nancy's time to go home tonight ...

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