Bindi Irwin and Derek Hough have rumors brewin' ... 'cause during "Dancing with the Stars" it sounded like one of 'em let a celebration fart rip.

At the end of Monday night's results show, Bindi and Derek found out they were safe. Derek promptly scooped up his 17-year-old partner and you can clearly hear the alleged toot. It's unclear just who done it, but it sounds way too much like a didgeridoo to not at least bring Bindi in for questioning.

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