It seems that Katy Perry has a certain sales tactic when it comes to promoting her fragrance.

The singer found some time in her busy touring schedule to appear at an instore signing in Cologne, Germany today to promote Purr.

And just as when she launched the perfume last month in Mexico City, Katy poured herself into a very тιԍнт and revealing purple dress for the occasion.

The 26-year-old wore a skinтιԍнт bandage dress by Herve Leger to greet her fans.

And the keyhole neckline gave a provocative peek at her ample cleavage.

Her appearance was not so different to a few weeks ago, when she attended another pH๏τocall to promote Purr.

Then, the Teenage Dream singer wore an even more risqué frock, which plunged almost to her navel.

There was only a thin piece of sheer mesh holding the plunging neckline together, giving onlookers an eyeful of her cleavage.

Katy will perform tonight in Cologne, before playing dates in Hamburg, Amsterdam and then moving on to London.

As well as promoting her perfume and touring, Katy has been hard at work on her film debut.

A sneak peek of Perry in the new Smurfs film as Smurfette was released today.

In stills for the the newly released trailer, her character wears her iconic pretty white dress and demure matching heels.

The new Smurfs trailer shows Smurfette struggling with her skirt as it blows up over a grill, evoking Marilyn Monroe’s iconic scene in The Seven-Year Itch.

In others,The Smurfs gang are seen on numerous adventures as they roam New York as they try to avoid the evil wizard Gargamel.

The plot sees Gargamel chasing the Smurfs out of their magical village and into Central Park.