It’s Taylor Swift!

Yep, Taylor Swift penned this week's lyrics:

"You could write a book on how to ruin someone's perfect day."

They come from her song 'Tell Me Why,' which can be found on her second album, 2008's 'Fearless.' We're not sure if anyone ruined any of her perfect days this week, but she put in a stellar performance at the Brit Awards on Wednesday, singing her latest single 'I Knew You Were Trouble' while wearing what looked like Beyonce's Super Bowl outfit.