The 'Firework' hitmaker arrived in the Americana at Brand in Glendale, California, in a very classic blue convertible with matching blue dress, footwear and hair Pink ghd for that official launch of the assortment and earlier while in the day she had tweeted her excitement.
She wrote: ''Today has been a Beautiful day! U debuted ''Part Of Me'' at #1 & now I can't wait to bat my LASHES & thank u in person @ the Americana at 4pm! (sic).''
The Eyelure assortment is currently available at ULTA.com and the eyelash company revealed she was very hands on with the collaboration, which mimics her ''personal style''.
A statement said: ''As a false lash lover herself, Katy had a very clear idea of what she wanted to achieve Pink ghd hair straighteners and was involved in every step from the design process.
''We have been keen to produce a range of lashes that have been a direct extension of her own personal style.''
This isn't Katy's first venture outside of pop, the busy star has also created two perfumes and became the global ambassador for hair styling brand ghd last year.
Paul Stoneham, ghd Chief Executive Officer explained: ''Katy is the epitome of modern fashion and styling. Her unique, ever changing looks are the envy of style devotees around the world. Katy completely embodies ghd's spirit of female transformation Hot Pink ghd and empowerment, as she is seen as a cutting edge style icon unafraid to push fashion and beauty boundaries. Sassy, stylish and sexy, Katy is the perfect partner for ghd.''