Good job, Selma Hayek. Women did this for each other for millenia before formula. I think this is why we let down milk even when someone else's baby cries.
(I have to admit, now I'm wondering if Angelina Jolie is pumping her milk to ship to Sierra Leone.)
http://www.huffingtonpost.com/2009/02/10/salma-hayek-breastfeeds-a_n_165676.html