The huge star will play London’s O2 Arena on Friday 24 August, with another show now added for Saturday 25.
However both dates are proving tricky for fans today, with demand incredibly high.
Ticketmaster announced on social media: #tmAnnounced! Due to incredible demand, @BritneySpears adds a show in London on Saturday 25 August. Tickets on sale now.”
The date joins her shows in Scarborough on August 17, Manchester on August 18 and Glasgow on August 22.
She is also headlining the Brighton Pride festival on August 4, and playing a string of other dates around Europe.
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Fans have been struggling to find tickets, with one saying: “Totally devastated, so wanted to go to see #BritneySpears at the #o2 they sold out at 10am, I was ready & waiting #gutted.”
Another raged: “@TicketmasterUK you need to do ALOT more work on how people snap up tickets to just sell them on. It’s like competing in the hunger games to see @britneyspears and I’ve been vigilant.”
Tickets have begun appearing on resale sites for extortionate prices, leaving some fuming.
“@britneyspears tickets sold out from 10am on the dot yet over 1000 for sale on get me in! What a joke,” tweeted one disgrunted fan.
Indeed some seats for the O2 show are currently selling on GetMeIn for as much as £935.
TicketMaster have updated fans on Twitter with news that mostly Platinum tickets remain; although they have promised they are “working on getting you more #PieceOfMe tickets. Watch this space.”
There had been disappointment yesterday as well when ticket websites crashed during the fan presale, putting added pressure on today’s release.
Spears is touring her Piece of Me set, which recently finished a record-breaking four-year run in Las Vegas.