Chrysler is displaying a Lancia Delta carrying a Chrysler grille at the Detroit motor show.
Company sources say the plan is to try and push Chrysler upmarket in the US, and it hopes that Lancia's 'sophisticated, fashion associated' image will rub off.
Pre-show reports also said that Fiat would display an all-eletric Fiat 500 on the stand, although this has yet to be put on show.
The Chrysler stand is also being used to showcase vehicles from Fiat's luxury offshoots, Ferrari and Maserati.
The 500 hatchback will go on sale in the United States in late 2010, while the 500C is scheduled to go on sale in 2011.
Chrysler will build the North American 500 at its plant in Toluca, Mexico from next year, offering it with a 1.4-litre petrol engine ranging from 99bhp to 173bhp.