Taylor Swift has rocketed to the top of the U.S. pop charts thanks to the fourth biggest download sales week ever. The singer's new single Shake It Off debuts at number one, ahead of Nicki Minaj's Anaconda, which slithers up the chart from 39 to two. The track is Swift's second Hot 100 number one following 2012's We Are Never Ever Getting Back Together, which spent three weeks on top, and her 60th U.S. chart hit. The new all-girl top three is completed by Meghan Trainor's All About That Bass. Sam Smith's Stay With Me and MAGIC!'s former number one Rude round out the new top five.