Her final show was originally set to be a single Earls Court gig on July 4. With the additional dates, her run now stretches through July 12.

The British press had speculated that more dates would be added at the London venue but there’s no word whether Madonna will tack on additional dates anywhere else.

Fans camped out overnight at Earls Court to get tickets for the July 4 show and the 16,000-seat venue sold out in 15 minutes, according to promoters. The best seats went for £85, about $127.50 per ducat.

The timing could have been better – the ticket prices were made public about the same time English news reports pegged la mama diva as the sixth richest pop star in Britain.

In all fairness, Madonna didn’t get to be Madonna by doing no-frills shows, and big stage productions cost big money. She promises a show to “mind-boggle the senses” this time out and there’s no reason not to believe her.

Her promoters at SFX, who know a thing or two about mind-boggling, said the 18-city international caravan would be “the most extravagant stage spectacle of her career … a celebration of artistry and technology.”

Though ticket prices for her U.S. tour leg haven’t yet been announced, it’s quite likely they’ll be in a similar price range.

Madonna hits the road June 5 in Cologne, Germany, and reaches American shores July 21 in Philadelphia. She will perform in 12 arenas in major U.S. markets before the tour closes September 9 at the Staples Center in Los Angeles.