Katy Perry and beau John Mayer have reportedly split up for the second time this year.

The 'Roar' hitmaker and the 'Gravity' rocker previously parted ways in March 2015, due to Katy's ''trust issues'' and John's lack of ''anything major going on with his career''.

However, now it has been reported they have separated once more.

A source close to the couple revealed that they've called quits on their romance, despite attempts to rekindle their relationship in January.

E! News reported that the insider didn't give any insight as to why they ended their on/off partnership this time round, but highlighted the couple are known to call things on and off frequently and always make up.

A source previously gave reasons for their last break up earlier in the year.

The insider told RadarOnline: ''Katy and John reconnected once she had a break in her Prismatic World Tour. So, for those few months they had a great time, pretending that it would last - and of course it didn't.

''The reason they have split in the past is because Katy gets busy. John can't handle the lack on attention, and she can't handle the trust issues she has when she's so far away. So they've learned that it's better to just take a break when they can't be in the same place.''

Neither Katy or John have commented on the split.