ELY, Minn. (AP) — Internet sensation Lily the black bear has again given birth in her northeastern Minnesota den — this time to twin cubs.

The first twin was born at 1:51 p.m. Friday, and the second followed at 3:03 p.m. That's according to a Facebook post by Sue Mansfield, a biologist at the Wildlife Research Institute and North American Bear Center in Ely (EE'-lee).

The Duluth News Tribune reports Mansfield wrote on the center's blog that Lily began clenching her teeth Thursday evening. That was what signaled the beginning of labor last year before she gave birth to her cub Hope while viewers watched on a web camera.

The bears have been holed up in their den since October. A web camera installed last month has chronicled the pair's activity. Click here to see the web camera.