it's possible there is a photo of it yes,... whether it ended up on the internet i have no idea, may have been on one of the boys sites.
the thing is, that is how she looks, she had a nice pic taken, she posted it on twitter, as I am sure she posts many non-breastfeeding pics...
i dislike the implication that somehow someone is wrong for posting a picture of themelves breastfeeding, just because it may make other people think they're smug.. it's bizarre
why on earth shouldn't she post a pic saying "hey. look at me with my baby, isn't he cute" and the caption "another day at the office" or whatever it was is surely just her expressing how much stuff has changed and how she still has to take time to do this stuff despite working as well
and i am sure she isn't the only person who feels proud to do this and who posts about it online, famous or otherwise