Selena Gomez's favorite song is Taylor Swift's 'I Knew You Were Trouble', which has been rumored to be about her alleged new boyfriend, Harry Styles.
On the eve of the official video's release, which is later today, Gomez posted this video on YouTube of 'her and her girls' dancing to the song following a choreography by Gweny.
Then she posted a link to it on Twitter, which was re-tweeted by Swift herself.
Today, December 13th, is Swifts 23rd birthday and the day of the premiere of her 23rd video, or so she said.
December 13th is my 23rd birthday, and also the premiere of my 23rd video. How fun.— Taylor Swift (@taylorswift13) December 10, 2012