This week in the world of celebrity social media, we got a glimpse of London Fashion Week action, photo shoot fun, and on-set shenanigans. British babes Sienna Miller and Poppy Delevingne partied in costume, while the handsome Harry Styles took in some runway shows during the weeklong event. Former child stars Britney Spears and Mario Lopez traded stories (as well as their own dolls!), and Beyoncé made time to do some sightseeing while on tour in Rio de Janeiro, Brazil. Ellie Goulding got some air while promoting Drake's upcoming album, and Miranda Kerr tested out her new eco-friendly hair dryer. The guys of Glee slipped into their best Beatles-inspired suits while shooting a tribute episode for the show, and Mike Tyson and Jake Gyllenhaal posed for photos together while backstage at a talk show. Meanwhile, Jessica Biel got a giant bouquet of flowers from a male admirer — but it's not who you might think!