I think news that the very popular pregnancy book, What To Expect When You’re Expecting, was going to be making its big-screen debut took everyone a little bit by surprise, given that the book itself isn’t so much a novel as a does-what-it-says-on-the-tin guidebook. (I believe – I’m yet to be expecting, myself.)

In reality, the film isn’t specifically adapting the book itself, but rather taking the idea and turning it into a film, and Yahoo Movies have just put up the first trailer, and it looks pretty excellent; a rom-com for us to look forward to next year.

When you have an ensemble cast that includes the likes of Elizabeth Banks, Anna Kendrick, Cameron Diaz, Dennis Quaid, Jennifer Lopez, Chace Crawford, Chris Rock, Matthew Morrison, Thomas Lennon, and Joe Manganiello, it’s either going to be a huge hit or a big disappointment, and this certainly looks like it’s going to be a success.

As you can imagine from the title, the film centres around five couples on the path to parenthood, and the trailer looks like the comedy should be coming in doses just as big as the romance, and with a cast that big, it should have a pretty wide appeal.

Kirk Jones (Nanny McPhee) has directed a script written first by Heather Hach (Freaky Friday) with a rewrite coming from Shauna Cross (Whip It), with the original source material being Heidi Murkoff’s book of the same name.

What To Expect When You’re Expecting, which is also set to feature a cameo from our own Cheryl Cole, will be released here in the UK on 18th May next year, and it looks like it’s going to be a great light-hearted way to see out the end of spring ahead of the immense summer blockbusters we’re all looking forward to.

That release date currently lines it up against Sacha Baron Cohen’s next film, The Dictator, with Tim Burton’s Dark Shadows coming out a week before it and Men in Black III coming out a week after. Without further ado, here’s the great first trailer for the film (with the exception of the pretty poor and far too obvious ‘Expect the Unexpected’ tagline at the end). Enjoy.