Katy Perry dished out a double dose of purple in two different looks at promotional appearances for her fragrance, Purr, in Mexico City over the weekend. She showed a whole lot of skin with a daring purple dress for a party on Friday, and yesterday she wore something short and sparkly for an afternoon photo call. The singer headed south to promote her first scent, which is her latest beauty effort after she made a crackly nail polish for OPI. Katy spent Super Bowl weekend away from the States, but her music ended up being a big part of the evening — her "California Gurls" opened the highly anticipated post-game episode of Glee, and there's more to come on Tuesday's installment of the series. Katy will have some prime time fun of her own this evening, with her cameo on How I Met Your Mother finally going to air.