Nothing too bad for the romcom genre, though there are the requisite plot-driving shenanigans: A woman pretends to be someone she's not to land a fiancé ... who happens to be the man her sister loves; a reporter deceives a woman, making her think he's writing about something else when she's actually the subject of his exposé; a woman humiliates her sister at her engagement party. The overall message (that women aren't happy unless they're the bride, instead of the bridesmaid) feels a bit dated.
A woman slaps a man (hard) after he wrongs her; two sisters argue loudly, with one throwing objects at the other.
Deep kissing and making out (on a couch and in a car); sexual innuendoes (e.g. "walk of shame" and hooking up at weddings); a woman stands in her lingerie during a dress fitting.
A fairly generous sprinkling of the word "s--t," plus "whore" and "a--hole."
Visible/referenced brands include Budweiser (a bottle appears fairly prominently in one scene) and Filofax; the dressing room of Amsale, a wedding dress designer, is shown in one scene.
Lots of drinking at wedding receptions; in a major scene, the two leads get plastered after drinking lots of hard liquor and beer.