Katy Perry has augmented her 2014 UK tour with two new dates.

The US star previously announced a number of arena Prismatic dates due to take place in May, with Icona Pop as support.

However, it seems they are selling well and this has prompted her team to add two more shows.

The new dates will take place at Birmingham's LG Arena on May 14 and the Manchester Phones 4 U Arena on May 24.

Tickets for those two concerts will go on sale from 9am UK time on Friday (November 29).

The new full schedule meanwhile is as follows:

• Wednesday May 7 Belfast Odyssey Arena
• Saturday 10 Newcastle Metro Radio Arena
• Sunday 11 Nottingham Capital Fm Arena
• Tuesday 13 Birmingham LG Arena
• Wednesday 14 Birmingham LG Arena
• Saturday 17 Glasgow The SSE Hydro
• Sunday 18 Glasgow The SSE Hydro
• Tuesday 20 Manchester Phones 4 U Arena
• Wednesday 21 Liverpool Echo Arena
• Friday 23 Sheffield Motorpoint Arena
• Saturday 24 Manchester Phones 4 U Arena
• Tuesday 27 London O2 Arena
• Wednesday 28 London O2 Arena
• Friday 30 London O2 Arena
• Saturday 31 London O2 Arena