3. When they hit the number one spot for the song.
4. And tweeted this to their old record label.
6. …and their performance stole the whole show.
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Cameron Spencer / Getty Images
11. When they shared this amazing flashback.
14. And weren’t afraid to poke fun at themselves/each other.
15. When they found the perfect promo time and ran with it.
16. When they also took time out of their busy schedules to support important causes.
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Tahlia Pritchard is a senior writer for BuzzFeed and is based in Sydney.