Katy Perry is fast becoming the new Lady Gaga of the colouring scene. Fresh from her short-lived stint as a blonde, the "Firework" singer has been spotted in LA with pink hair! Late last month Katy tweeted: "I have been dying my hair since 10pm! Good GOD let me get to my destination tonight! #beenblack #beenblue #beenhotginge #beenblonde #now…" but we haven't actually seen the efforts of her mammoth hair colouring session until now! What do you think?