Katy Perry skips backstage before concerts - to test her outrageous costumes against 'wardrobe malfunctions'.

The I Kissed A Girl hitmaker insists on her jump rope test - because she is scared she might accidentally bare her breasts in the middle of one of her trademark energetic dance routines. Katy Perry, who has nicknamed her breasts The Twins, has blogged about her pre-show precautions on her Twitter.com page, stating, Usually I test out an outfit b4 (sic) shows by jumpin' rope, make sure The Twins r (sic) gonna stay in the holder.And she reveals she almost had an onstage accident during a gig in Arras, France earlier this month (Jul09): “(When) I didn't test. (I) almost had a SHOW!”