Former Doctor Who actress Billie Piper is set to star in the TV adaptation of the best-selling book about the life of a prostitute.
Tiger Aspect went to Channel 4 with Piper in mind for the lead role
Belle de Jour began as a weblog, with an anonymous woman going into explicit detail about her sex life.
Now it is "in development" as a TV show for Channel 4, with Piper "attached" to the lead role.
No timescale for filming has been set, but a Channel 4 spokeswoman said: "It's quite a way from going on-air."
Production company Tiger Aspect approached the broadcaster with the idea, she said.
Until last year, Piper, 24, starred as the Time Lord's companion, Rose, in the sci-fi series Doctor Who.
She has also appeared in Victorian drama The Ruby in the Smoke, and is due to play Fanny Price in an adaptation of Jane Austen's Mansfield Park.
And her 1999 hit Honey to the Bee re-entered the top 20 last month after DJ Chris Moyles encouraged listeners to download the song and put it back in the chart.