Instagram is one of our many obsessions, and celebrities have likewise utilized the social site by sharing their personal photos. Katy Perry is the latest star to join, following in the footsteps of other pop stars like Britney Spears and Taylor Swift. Last month Ellen Pompeo also became a member of the photo-sharing phenomenon and kicked off her account with sweet snaps of her daughter, Stella. Other stars who have joined Instagram over the past year include Justin Timberlake, who hopped on the bandwagon during the Grammys this year, and Beyoncé, whose Instagram induction came on Election Day 2012.
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