Justin Bieber - 'What Do You Mean?'
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From Ed Sheeran To Taylor Swift - 23 Songs Written About Other Celebrities
2. Justin Bieber - 'What Do You Mean?'
They've been the most infamous "on again, off again" couple for as long as we can remember, but when this duo aren't yo-yo dating, they're writing songs. Whilst he's not confirmed that 'What Do You Mean?' is actually about his ex, the music videos DOES include his former bae's name. Awkwardly, when Justin performed the track for the first time at the 2015 MTV VMAs, Selena left the venue with the ENTIRE of BFF Taylor Swift's #BadBlood crew. Eek! (Pictures: Getty)