Since they met at a party, ambitious high-flyer Nat (Rose Byrne) and struggling novelist Josh (Rafe Spall) have been deliriously happy despite their differences. Josh is a thinker, Nat’s a doer, he’s lasses faire and she’s quite anal… but the spark between them is undeniable.

Their wedding is a dream come true, but family, friends and even the minister who marries them aren’t convinced that they can last. Josh’s ex-girlfriend, Chloe (Anna Faris), and Nat’s handsome American client Guy (Simon Baker), could offer attractive alternatives…

With their first anniversary approaching, neither wants to be the first to give up, but will they make it?