Katy Perry to launch world tour behind ‘Prism’ in May

Katy Perry will hit the road next year in support of her album “Prism,” the pop star announced Monday.

The news came in a wee-hours tweet from Perry, who wrote that she was “ecstatic” to reveal the initial dates of what she’s calling the Prismatic World Tour.

Set to launch May 7 in Belfast, Northern Ireland, the trek is to wind its way through England and Scotland before ending up at London’s O2 Arena for three shows May 27-30. Perry’s support act for the British run will be Icona Pop, the Swedish duo responsible for the shouty stadium-rave hit “I Love It.”

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Icona Pop will be busy: Last week Miley Cyrus announced that she’d selected the group to open a string of upcoming North American arena shows (including a Feb. 22 stop at Staples Center).

Addressing her fans in countries besides Britain, Perry said on Twitter, “DON’T WORRY -- more GLOBAL tour dates coming soon! I can’t wait to get closer to ALL of you than ever before.”

The singer’s previous road show, called the California Dreams Tour, earned a total gross of $48.8 million in 2011, according to Billboard, which ranked the trek at No. 13 on that year’s list of top-earning tours.

On Sunday, Perry is expected to open the American Music Awards, which are to be broadcast live from L.A.’s Nokia Theatre.

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