With performances scheduled from September through February 2018, Katy Perry's Witness: The Tour is rounding out what is sure to be an incredible show with great opening acts.

Starting in January, Carly Rae Jepsen will join Perry to round out the tour's North American leg. Noah Cyrus, Miley Cyrus' sister, will be the tour's first opener, displaying her own brand of unique emotional impact. Megan James and Corin Roddick are Purity Ring, coming onboard for November shows through year's end with their captivating electronic beats, currently on display in the tracks they produced on Perry's Witness album.

Jepsen's "Cut To The Feeling" — rated the best song of 2017 so far by Spin — revisits the pop urgency that led her to two GRAMMY nominations for 2012's "Call Me Maybe."

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So before Perry assumes her judging duties on "American Idol" this fall, she's already made three good picks where it counts for her personally, setting up her audiences for a pop knockout.

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