39岁的陈嘉玲，没房没车没老公没小孩，还丢了工作，正式加入女鲁蛇的行列。这是什么意思呢？这表示当年不惜引发家庭革命也决心要离开家乡的她，在台北奋斗了近二十年，到头来是一场空。说到淑女，就要先从她的家庭谈起。台南纯朴的乡下，三代同堂，全靠阿公开的中药行维生。身為长孙女的陈嘉玲，和台湾十大建设差不多时间出生，与台湾经济同步成长。小时候的陈嘉玲，没有人陪她玩的时候，她就自己找乐子；没人陪她说话的时候，她就自己跟自己对话。她是这麼宝贝她自己，想尽办法让自己开心。而长大后，即将迈入四十岁的陈嘉玲，虽然一路跌跌撞撞，也是货真价实地活了大半辈子。爱过人，也被人爱过；被人负过，也负过人。就算现在一无所有，天也不会塌下来。她不知道接下来的路要怎么走，但他告诉自己，接下来的每一天，她至少可以不违感受，平凡但诚实，普通但理直气壮的往前走，做一个接受自己的「俗女」。

GiGi(Ginnifer Goodwin 饰)是个对爱情充满幻想的女孩儿，却在一次次约会中受挫。她的闺蜜Beth（Jennifer Aniston 饰）和Janine（Jennifer Connelly 饰）不断鼓励GiGi在感情中振奋起来，却各自对爱情怀有遗憾。Beth与Neil（Ben Affleck 饰）同居七年，却一直未能等来期待的那枚婚戒。Janine的敏感让她与Ben（Bradley Cooper 饰）的婚姻陷入僵局，而Ben与歌手Anna（Scarlett Johansson 饰）的婚外情更是给他们的婚姻雪上加霜。Anna一边拒绝拥趸Conor（Kevin Connolly 饰）的示好，一边热情似火的期待Ben离开Janine，可是Ben真的能离开Janine来到她的身边么？另一方面Anna的好友Mary（Drew Barrymore 饰）在一个清晨和Conor面对面的不期而遇了。
几个女孩儿带着爱情的梦想在城市中跌跌撞撞，而此时一直未遇真爱的GiGi在酒吧老板Alex（Justin Long 饰）的口中听到了让所有女人心碎的话“He is just not that into you!”

More than a dozen Angelenos navigate Valentine's Day from early morning until midnight. Three couples awake together, but each relationship will sputter. A grade-school boy wants flowers for his first true love. Two high school seniors plan first-time sex at noon. A TV sports reporter gets the assignment to find romance in LA. A star quarterback contemplates his future. Two strangers meet on a plane. Grandparents, together for years, face a crisis. An 'I Hate Valentine's Day' dinner beckons the lonely and the lied to.

When yet another anniversary passes without a marriage proposal from her boyfriend, Anna decides to take action. Aware of a Celtic tradition that allows women to pop the question on Feb. 29, she plans to follow her lover to Dublin and ask him to marry her. Fate has other plans, however, and Anna winds up on the other side of the Emerald Isle with handsome, but surly, Declan -- an Irishman who may just lead Anna down the road to true love.

When she learns she's in danger of losing her visa status and being deported, overbearing book editor Margaret Tate forces her put-upon assistant, Andrew Paxton, to marry her.