They went through to the next week on the casting vote of head judge Len Goodman.
In week 5, the couple received their lowest score of the competition so far and were second from the bottom on the leaderboard.
However, they were saved from the dance-off by the public.
The couple were eliminated in Week 8 of the competition, when the show went to Blackpool, after performing a cha-cha-cha.
Cacace returned to Strictly Come Dancing for the seventh series in 2009, partnering Coronation Street and Queer as Folk actor Craig Kelly.
The couple were in the bottom two in the second week against Lilia Kopylova and Richard Dunwoody, and were forced to perform their tango again.
She also took part in the 2007 Christmas special dancing the rumba with partner Matt, and achieved a score of 39.
Flavia Cacace-Mistry (born 13 March 1980) is an Italian British professional dancer.
Her professional dance partner is Vincent Simone (they are branded when performing together as 'Vincent and Flavia'), and for ten years both partners appeared on the BBC's Strictly Come Dancing.
They got the only perfect score of the main series for their waltz in the final.
The couple subsequently had a three-year off-screen romance.
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They won votes from three of the four judges and consequently made it through to the third week of the competition.