Paramore frontwoman Hayley Williams has expressed her outrage after news of the band's upcoming tour with Fall Out Boy leaked online before the official announcement.

Rumours suggesting the two bands are preparing to hit the road together have been swirling online, so the singer took to her page on Thursday (09Jan14) to confirm the story.

However, Williams also admitted she was angry that the report had surfaced early on the Internet as both bands had been trying to keep the news secret.

In a series of posts on, she writes, "Yes. It's happening. Us & Fob (Fall Out Boy) co-headliner. Sucks some bonehead leaked it. We wanted to surprise you guys. Surprise, I guess! Monumentour... Thank you to both Fob & Paramore fans for begging us for years to make this tour happen... 'Bout damn time. This is monumental."

Fall Out Boy star Pete Wentz also confirmed the news by posting a picture of a cat in a paper bag on his page with the caption, "Cat's out of the bag - the rumours are true. Not the way it was supposed to go down."

The joint U.S. tour will include 34 shows and kicks off in Connecticut on 19 June (14). The shows will conclude in Concord, California on 17 August (14).