The 23-year-old socialite - who already has seven-month-old son Astala - is expecting another baby boy with her rocker husband Tom Cohen, but admitted she is nervous about becoming a mother again so soon.
Peaches - who is into her fourth month of pregnancy - told Britain`s HELLO! magazine: "Finding out I was pregnant again so soon was quite a shock. Tom was so happy. He loves being a dad so much and is brilliant with Astala, who totally adores him, so he was over the moon.
"I, on the other hand, did have a momentary panic and go, `Oh my god, we`re going to have a one-year-old and a one-month old! How will we cope?` "
The blonde star - who is the daughter of Bob Geldof and his late ex-wife Paula Yates - is planning to move out of London to raise her sons in Surrey, South East England, and she and Tom are delighted that Astala will have a brother to play with.
She explained: "There are massive benefits to having two children so close together. Astala`s such a happy, sociable little boy, I think he will adore having a sibling... As much as I would love to have a daughter one day, I am thrilled Astala will have a brother. They can share clothes and toys and do boy stuff together."
Peaches plans to name her son Phaedra, and she explained: "It`s a name that comes from an ancient Greek play. But it also features in a song Tom and I both love called `Some Velvet Morning` by Lee Hazlewood."