The 'Dark Horse' singer responds to the 'Wrecking Ball' singer's twitter bashing yesterday.
Week's Top Stories
This week's biggest news stories in 60 seconds
Face Swaps, Selfies And Katy The Weather Girl! Enjoy...
The 'I See Fire' star gives a short acoustic rendition of Queen Bey's latest track.
The 'Happy' star has thanked restaurant chain Arby's for their huge bid to win the accessory.
The 'Hot N Cold' singer gives early rises a treat when she delivers a unique take on the day's forecast.
The One Direction man has been working with the Irish band this week on a "massive" sounding new tune.
The Killers, Rizzle Kicks, Bastille, Rudimental and more will also perform at this year's event.
The group will play five shows in five countries over five days.
This Week's Most Viewed Photos
The stars were out in force at the Oscars this week and one female singer found herself in the mouth of a shark! Check out the best pics from the world of pop this week.
From Ed Sheeran's battles with salad (!) to Calvin Harris confirming some VERY exciting news... see EVERYTHING you may have missed on Twitter this week.
Route 94 released his new single 'My Love' at midnight and it went straight to No. 1 on the Vodafone Big Top 40.
The pop stars of today get to travel ALL over the world performing their songs in front of huge crowds. But even they don't want to miss out on the globe's biggest tourist attractions! See what the stars get up to on their worldwide days off...
Recently Played Tracks
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Live Top 10
1 Route 94 My Love (feat. Jess Glynne)
4 Dvbbs & Borgeous Tsunami (Jump) [feat. Tinie Tempah] [Radio Edit]
7 A Great Big World & Christina Aguilera Say Something
8 Tiësto Red Lights
9 John Legend All of Me
10 Enrique Iglesias I'm a Freak (feat. Pitbull)