Busty Rihanna gets inflated

RIHANNA performed in some bizarre clobber during the Vancouver leg of her Last Girl On Earth tour.

Rear-ly great ... Rihanna

BIG

The Umbrella star took to the stage in an inflated white dress that looked like she might take off in at any moment.
In typically raunchy style, she teamed the LADY GAGA-esque outfit with killer heels and PVC bra.
The sexy Barbadian also showed off her rock credentials by getting on her knees as she played the electric guitar and cheekily stuck her tongue out.
If she goes any further, they'll need to put an 18 age restriction on her gigs...

Going GaGa ... Rihanna

Rock chick ... Rihanna 

Sex kitten ... Rihanna