The campaign is aimed at reinforcing the drink's Italian style, heritage and premium cues, and encourage younger consumers to drink the brand, which has an annual value sales of £55m in the UK.
The Martini Royale Casting is a global search to find a woman who demonstrates Martini's 'Luck is an Attitude' philosophy.
The casting winner will also receive €150,000, (£122,000) 12 pairs of Christian Louboutin shoes, and 12 designer outfits.
The successful candidate will be chosen in October by Christian Louboutin and a high-profile judging panel. Women will be able to enter via , where they will be required to upload a short video showing why they should be the next brand ambassador.
To honour Christian Louboutin's 20th anniversary in operation, Martini is also sponsoring his retrospective exhibition at the London Design Museum.