The Salahis -- G'day to 'Dancing with the Stars'

Alleged White House crashers Tareq and Michaele Salahi are HUGE down under -- in fact, we're told, the "Real Housewives of DC" stars are closing in on a deal to appear on Australia's "Dancing with the Stars."

The offer's already on the table for next season -- and sources tell TMZ, Tareq and Michaele are just hammering out the nitty gritty before signing on the dotted line.

And to prove just how famous they are over there -- we're told the couple also shot a commercial for an Australian laundry detergent last week ... LAUNDRY DETERGENT.