'The Witches': Anne Hathaway on how she played the child-hating Grand High Witch while secretly pregnant - USA TODAY

Anne Hathaway didn't tell anyone on "The Witches" set that she was pregnant.

A strong argument could be made that Anne Hathaway spent a lifetime building up to her role as the most evil Grand High Witch in the Roald Dahl adaptation "The Witches.".

The Oscar-winning actress, 37, posted pictures of her adorable youngster self throwing a spell as a rainbow-wigged witch on Instagram with the caption, "How it started." Decades later, stepping into the role of a saucy sorceress with diabolical plans to turn all kids to mice, Hathaway found out she was pregnant with her second child Jack (now 11 months) with husband Adam Schulman.

Anne Hathaway brings grand fashion: Her five most enchanting 'The Witches' looks?

Anne Hathaway was not all evil the Grand High Witch in "The Witches." Her real son Jonathan, 4, named her snake ornament, Snix the Snake?

Question: Your young Anne Hathaway witch posted on Instagram was divine, what did you bring to that as a child.

Anne Hathaway: I brought imagination, a sense of adventure and I hope a cackle.

Hero Boy (Jahzir Bruno) is turned into a mouse (far right) by the Grand High Witch, joining felling cursed creatures Codie-Lei Eastick (far left, voiced by Bruno Jenkins) and Daisy (Kristin Chenoweth). (Photo: Warner Bros. Entertainment).

Q: It's pretty incredible you were covertly pregnant while playing a child-hating witch?

Hathaway had wig input for her Grand High Witch. (Photo: Courtesy of Warner Bros. Enterta)

Q: Did you have input on those amazing Grand High Witch wigs

Q: The witch-in-repose turban look is my pick, what's your favorite Grand High Witch fashion moment

When I told my son I was wearing a snake dress at work and that the snake needed a name, he named it Snix the Snake

Snix the Snake was just the best