Harry Styles covers Ariana Grande, One Direction songs in solo tour kickoff

Harry Styles went big for his first solo tour performance. Really big. Grande-sized.

In news that will send fans into a tizzy -- and infuriate those who couldn't snag concert tickets -- Styles covered Ariana Grande on Tuesday night. He also performed stripped-down versions of two One Direction numbers.

Wearing a floral suit (obviously), Styles unexpectedly transitioned from his own tracks into Grande's "Just a Litltle Bit Of Your Heart," which he co-wrote. He also put a new spin on One Direction songs "Stockholm Syndrome" and "What Makes You Beautiful."

Billboard called his covers reminiscent of Mick Jagger or the Beatles, making "all of the pop covers his own."

Fans captured footage of Styles' San Francisco covers, which you can watch below.