BFFs Katy Perry and Rihanna share a crazy sense of fashion. It appears they also trade shopping tips. Both gals have been wearing dresses from online store ASOS.com. Are you dying for Katy's sequined palm tree dress or Rihanna's striped dress? Get them at ASOS, where you can shop by celebrity to browse things worn or inspired by your fave star's style.

Paris Hilton loves T-Bag's brightly printed jersey dresses. Their fun, airy colors are perfect for her bubbly personality. Take your pick of these sassy summer frocks at up to 55% off on Gilt. Registration before the sale ends on Thursday, June 24.
Selena Gomez rocked a flirty Alice + Olivia dress on Spanish TV and now you can scoop up her exact dress! Head to Singer22 for Selena's strapless, sequin Maggie dress. The site has an assortment of other celebrity favorites too, so take your time and snag some star style!