Ian first joined forces with Citroen in 2012 and drove their DS 3 as Brand Ambassador last year.
Last year, Ian also made his 100th appearance for Leinster. He currently has 13 caps for Ireland.
Picking up the car keys Ian said "The C4 Cactus is a very innovative and functional car that stands out on the road and is a really fun car to drive."
Louise Murphy, Marketing Manager Citroen Motors Ireland commented: "Over the past year, Ian has really come into his own with fantastic performances on the pitch for both Leinster and Ireland and we wish him the very best of luck in the Six Nations and the upcoming World Cup."
The C4 Cactus, Top Gear's Hatchback of the Year 2014, is Citroen's top-selling car to date this year, with prices from €17,795. It is available also from €159 per month.
