8. Katy Perry guest stars on How I Met Your Mother.
PHOTOS: Stars In The Best And Worst Fashions
PHOTOS: Katy Perry On Set Of How I Met Your Mother
1 of 9
 Katy Perry guest stars on How I Met Your Mother. Photo: Landov
|
PHOTOS: Katy Perry On Set Of How I Met Your Mother
2 of 9
 Katy Perry guest stars on How I Met Your Mother. Photo: Landov
|
PHOTOS: Katy Perry On Set Of How I Met Your Mother
3 of 9
 Katy Perry guest stars on How I Met Your Mother. Photo: Landov
|
PHOTOS: Katy Perry On Set Of How I Met Your Mother
4 of 9
 Katy Perry guest stars on How I Met Your Mother. Photo: Landov
|
PHOTOS: Katy Perry On Set Of How I Met Your Mother
5 of 9
 Katy Perry guest stars on How I Met Your Mother. Photo: Landov
|
PHOTOS: Katy Perry On Set Of How I Met Your Mother
6 of 9
 Katy Perry guest stars on How I Met Your Mother. Photo: Landov
|
PHOTOS: Katy Perry On Set Of How I Met Your Mother
7 of 9
 Katy Perry guest stars on How I Met Your Mother. Photo: Landov
|
PHOTOS: Katy Perry On Set Of How I Met Your Mother
8 of 9
 Katy Perry guest stars on How I Met Your Mother. Photo: Landov
|
PHOTOS: Katy Perry On Set Of How I Met Your Mother
9 of 9
 Katy Perry guest stars on How I Met Your Mother. Photo: Landov
|
