Jane Krakowski and Tina Fey reported to Rockefeller Plaza to film 30 Rock yesterday. Jane was covered up in layers to help disguise her trendy baby bump since Tina and the show's writers decided not to incorporate her pregnancy into the story line. Tina, meanwhile, was in Liz Lemon's usual casual gear. She's more dressed up on the cover of April's InStyle, which is hitting newsstands later this month to coincide with the release of her new book Bossypants. Tina's whole cast celebrated an exciting achievement recently when they got together to toast the 100th episode, and the comedy will continue tomorrow with a brand-new episode.