Taylor Swift has mocked an academic book for misquoting one of her songs.

The 25-year-old singer poked fun at the Princeton Review, an exam preparation book, for publishing incorrect lyrics from her 2009 hit 'Fifteen' and citing it as an example of poor grammar.

The book, which said "pop lyrics are a great source of bad grammar", claimed the lyrics read: "Somebody tells you they love you, you got to believe 'em."

However, the correct lyrics to the song are: "Somebody tells you they love you, you're gonna believe them."

In response, Taylor posted on Tumblr: "Not the right lyrics at all pssshhhh.

"You had one job, test people. One job."

Subsequently, the Princeton Review has issued an apology and even offered to send two of Taylor's fans to an upcoming concert.

The company tweeted: "Sorry @taylorswift13! We'll make it up to you. Pick a #grammar lover fan. 2 tickets to a U.S. show on us."

Meanwhile, Jaime King said recently that Taylor will be the "perfect" godmother to her unborn baby.

The 'Hart of Dixie' star, who is expecting her second child with husband Kyle Newman, believes she is the right person to take on the "sacred" role.

The actress explained: "I always knew she was going to be the godmother if I had another baby. Choosing a godmother is a very sacred and important thing in our family. They're going to be guiding your child, and they're responsible for them if something was to ever happen. We try and choose people who we know would raise our child the way that we would raise our child and her thoughtfulness, her kindness, her authenticity . . . is so powerful to me. She's so uninhibited in her giving . . . It's just beyond."