An exclusive report from E! News reveals that Katy Perry and John Mayer have yet again split up.

This happened after the Grammy winner have locked lips with Miley Cyrus last week at her Bangerz tour, but could this be the reason for another breakup of the on-again off-again couple?

The I Kissed A Girl singer's former boyfriend John Mayer may have "minded" the smooch, or not. The reason why the couple have called it quits yet again is because of Katy's upcoming world tour for Prism, according to an E! News source. The insider says the tour was a big issue for the former couple

As with any other performing artist dedicated to their craft, 29-year-old Perry is putting her work first. Despite this supposition for the reason of their breakup, the source adds that it is still unclear whether Perry's busy schedule and the tour was the actual final straw for the breakup.

The Dark Horse singer's schedule is packed to the brim from May till November. Katy took to Twitter yesterday to announce that she will be spending November in Australia and New Zealand. The star said in the Tweet, "PERTH, ADELAIDE, MELBOURNE, SYDNEY, BRISBANE! I'll be seeing YOU this November! Stay tuned for MORE info. And don't worry, New Zealand... I'm coming to see you kiwis too! Dates announced soon!"

Katy's former beau John Mayer isn't one to be left behind with a busy schedule as he is also set for a worldwide tour from April to June.

Signs of the former lovebirds on the verge of a split have been showing since Perry's recent trip to London and Milan. The talented performer returned home to Los Angeles on Friday, whilst Mayer remained in New York.

Also during Miley Cyrus' concert where Cyrus stole a kiss from Perry, Katy enjoyed the concert without Mayer by her side.

The first time that the couple went public with their relationship was during the summer of 2012. After which they split briefly, reconciled, split again last March, then started getting back together again.