The pop queen turns up at the London Monarch to see her pals...
'Thank You', famously sampled by Eminem, is to be released on May 21...
Eminem chum works on pop queen's forthcoming album...
Elton John's alter ego performed an acoustic set at HMV...
But don't rule out the Backstreet Boys and Nelly...
The woman sampled on the forthcoming single returns to her home city a far bigger name...