Count the catty clichés in the first 15 minutes alone: a lonely museum curator (Kristen Bell) breaks her heel at a party after the DJ mistakenly announces her engagement. (OMG, she’s single? Cue turntable scratch). Later, at her younger sister’s Roman wedding, a cute-but-late groomsman (Josh Duhamel) runs down the aisle, his cell phone going off. The rest of the plot succeeds only in turning the already-meagre charms of its stars into liabilities. Keep your coin far away from this toxic fountain of rubbish.