She hasn't officially announced she's pregnant, but there's no denying model Gisele Bundchen has got a bun in the oven, judging by these pictures.

We caught up with Gisele in Boston where she was running errands with a friend.

And she was doing her best to hide her belly from the photographers, but it's obvious she's putting on weight and will be a mommy by the beginning of next year.

More pictures of Gisele in the gallery below...