'I am doing a hundred things,' says Lakshmi, a chef, cookbook writer, model and occasional actor. 'But I think I find a few things to be as passionate about as doing something for children.'
She is among half-a-dozen celebrities involved in the Good Cents Initiative -- a campaign by the AIDS charity Keep a Child Alive. Model Iman also appears in the series of ads, which appear in glossy magazines throughout America.
The women, most of them dressed in black, pose against the headline: 'A dollar saves a life.'
While the 26-year-old Alba, who is smiling in a drizzle of pennies, represents a younger generation, Lakshmi, 37, and Iman, David Bowie's 52-year-old wife, appeal to an older generation.
Lakshmi -- the former wife of author Salman Rushdie -- is seen kneeling in front of an oversized US penny.
'As celebrities we have unique opportunities to bring about a change and make an impact,' Lakshmi says. 'I think it is a great challenge and it also gives one a lot of satisfaction.'