The singer now plays a second show at Manchester Arena, on June 13, as part of the jaunt.
Tickets for the new show go on sale this Friday, November 23. Tickets for the previously-announced shows are available now and are priced at £35-£75.
Rihanna this month marked the release of her seventh studio album with the 777 tour - seven live shows in seven days in seven different cities.
The sixth show took place at London's Kentish Town Forum.
The updated UK tour dates are as follows.
- June 10 - Millennium Stadium, Cardiff
- June 12 - Manchester Arena, Manchester
- June 13 - Manchester Arena, Manchester - NEW DATE
- June 15 - Twickenham Stadium, London
- June 17 - LG Arena, Birmingham
- June 20 - Stadium of Light, Sunderland