The Pussycat Dolls  have cancelled all but one of the North American dates on their ‘PCD Forever Tour’ amid reports of weak ticket sales. The ‘Don’t Cha’ girl group  announced in March that they had reformed as a trio , made up of  Nicole Scherzinger , Ashley Roberts and Kimberly Wyatt, and would be heading on a world comeback tour to celebrate the 20th anniversary of their debut album ‘PCD’. They announced an extensive 53-date tour, the first 33 of which were set to see them travel across North America, with  Lil’ Kim  and Mya, before heading to the UK and Ireland for nine dates in September. However, the group posted on Instagram yesterday (Monday May 4), explaining: “When we announced the ‘PCD Forever Tour’, we hoped to bring the show to fans across the world.…