Katy Perry often puts together some funky outfits that can be can fun to emulate this Halloween.

- To dress like Perry in her California Gurls music video buy a purple wig and a colorful short dress. For a second look from the same music video, get a bright blue wig, some jean shorts and Perry's bathing suit cupcake top. The costume can be found here.

- When Perry promoted her ad for ghd's air hairdryer, she dressed as a mermaid. To get her mermaid look, get a long pink wig, a green fishtail and a colorful bustier. There's some similar options here.

Rihanna Halloween Costume Ideas

- You can also go retro the way Perry did in her video for Last Friday Night. This look will require a bright pink midriff top and neon skirt. Wild and curly hair is a plus.

- In Perry's latest video for Roar, she dressed up similarly to Jane of the Jungle. Perry wears a green skirt and a midriff animal print top. A similar costume can be found here.

Scroll through our gallery to see these ideas.