The cheeky singer credited rapper Ludacris for the line, which is a lyric in his song 'Nasty Girl". Katy also said that she wants her pal Rihanna to strip at her bachelorette party.
"(I want to see) the whole bit. She's hot. I love her. She's the coolest chick and I want all of her clothes," she said on Chicago's Kiss 103.5 FM.