LONDON (Reuters) - American R&B singer Jason Derulo notched up his third British number one single on Sunday with "Talk Dirty", ending U.S. singer Katy Perry's two-week run in the No. 1 slot, sales figures showed. The Official Charts Company said with sales of nearly 160,000 copies over the past week, "Talk Dirty" has become the fastest selling single of Derulo's career in Britain and the fourth fastest selling single of 2013. "Talk Dirty", which also features rapper 2 Chainz, is the second single from Derulo's third album, "Tattoos", which will be released in Britain on Monday. ...