Celebrity babies are bursting forth all over this week - Kelly Rowland's had a boy, Robert Downey Jr has welcomed a girl, as have Rachel Bilson and Hayden Christensen (they named her Briar Rose, so - technically - she's already a Disney Princess...) , and all everyone can keep banging on about is if Justin Timberlake and Jessica Biel are going to be next. No wonder the pair are "worried" about confirming their baby news.

The couple - who are expecting their first child according to Us Magazine - are said to be holding back officially announcing the baby over fears of a mishap in the early stages of the 33-year-old actress' pregnancy.

A source told HollywoodLife.com: "They've been trying for a while to get pregnant, there've been some issues so that's probably part of it too, they don't want to announce it until it's further along and they're out of the woods for a miscarriage."

Justin, 33, also made it clear he is keen to keep the pregnancy private as he is 'freaked out' by the thought of his children receiving 'unhealthy and scary' attention. He'll no doubt be adopting the No Kids Policy - like Rachel and Hayden (but unlike Kim and Kanye...)

The source explained: "Justin is being super private right now, but that makes sense if Jessica is pregnant because he's always been bothered by the attention that celebrity kids get. It makes him angry and freaks him out because he thinks it's unhealthy for them and scary, so it's not a surprise at all that he's being so secretive about everything." That and it's his prerogative.

A "friend" of the Total Recall star felt the need to add: "Right now they are just enjoying the news for themselves. They just want a happy baby."

That's easily achieved. Routine, routine, routine. A difficult task when you've an unpredictable job, but at least Hollywood sorts usually have the funds to hand to create a stable environment.