In fact Calum seems to channel the 'Wrecking Ball' star a LOT in his selfies...

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#4YearsOf5SOS! Our 29 FAVE Instagram Snaps Of The 5 Seconds Of Summer Boys!

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See the full gallery: #4YearsOf5SOS! Our 29 FAVE Instagram Snaps Of The 5 Seconds Of Summer Boys!