Plot Twist: Julia Michaels Wrote the 'Austin & Ally' Theme Song So There You Go

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Julia Michaels had a pretty memorable 2017, with her debut single "Issues" becoming one of the biggest hits of the year. As many fans already know, she's a master songwriter and has co-written a slew of rather impressive hits like Justin Bieber's "Sorry," tons of songs with Selena Gomez including "Bad ...