Katy Perry and Robert Pattinson have added more fuel to the rumours surrounding their 'are they aren't they' relationship; they've gone on yet another date, this time to a Bjork concert. Now we should probably use the term 'date' lightly considering the fact that this pair will try to claim that they're just good pals but come ON, haven't you seen When Harry Met Sally? I'm a firm believer that the whole 'just friends' thing is a load of my proverbial hoop. 

The two stars have been getting cosier since the 'Twilight' actor split from Kristen Stewart for a second time three weeks ago. Katy was there as a shoulder to cry on but now it seems it's more than her shoulder that Pattinson's got his eye on. 

What's more? Rumour has it they're planning a Caribbean trip for two. 'Cause that's what platonic pals do y'see.

Katy - who recently ended her romance with John Mayer - and Rob went to see the Icelandic singer perform at the Pantages Theater on Saturday (08.06.13) but left separately to avoid paparazzi and the date follows the British star spending a week at Katy's house.

Some trusty snitch revealed to The Sun newspaper: 'They are both good friends but have been hanging out more and more recently... Rob poured out his heart to Katy about Kristen cheating on him. She proved to be a really good shoulder to cry on... He stayed at her house in LA after they went away to Santa Barbara together for few days over American Memorial Day weekend late last month. Their friends say they have now fallen for each other.'

The source added: 'They are talking about going to the Bahamas in the next few weeks to visit some friends of Katy's. They are both hopeless romantics, so it wouldn't be a surprise if things developed quickly.'