Baby #2 is on the way! Anne Hathaway announced her second pregnancy just an hour ago on Instagram (below) and there's a funny story as to how it went down ...

An X17 photographer was stationed at LAX, spotted the Princess Diaries actress and could see clearly she was sporting a baby bump. Anne wasn't trying to hide it -- she showed off her slender stems in skinny jeans and wore a form-fitting boucle tweed top that hugged her growing belly. Said photographer called into the office and we got to work editing and putting out the pix -- we're a photo agency, after all.

As we're doing this, Anne beats us to the breaking news, posting an Instagram photo of her baby bump with a caption about her fertility journey. It reads: "It’s not for a movie...⁣⁣
⁣All kidding aside, for everyone going through infertility and conception hell, please know it was not a straight line to either of my pregnancies. Sending you extra love 💕"

So happy for her and hubby Adam Schulman. The pair already have 3-year-old son Jonathan who'll now have a baby brother or sister! Congrats!