Indian or South Asian women have some deep innies.
I am not sure if it is the lighting, but M.I.A. seems to have a deep innie.
Of course, this can be a trick of lighting since her belly button looks normal here.
This seems to be the only major time that M.I.A.'s belly was seen by public.
The pictures are from The Village Voice Siren Festival in Coney Island on July 21, 2007.