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!
Click through to see the rest of this week's cutest celebrity candids, and be sure to follow POPSUGAR on Instagram , Facebook , and Twitter !
Harry Styles and Derek Blasberg had a pose-off.
Drew Barrymore  made a visit to Jackson Pollack's former home.
Kourtney Kardashian struck a glamorous pose on top of a mountain.
Ellie Goulding got some air while sporting a t-shirt to promote Drake's upcoming album.
Vanessa Hudgens  indulged in a yummy dessert.
Paris and Nicky Hilton  pulled a signature Terry Richardson pose after a shoot with the famed photographer.
Beyoncé looked fierce while posing near some street art in Rio de Janeiro.
Gisele Bündchen and Tom Brady  took in a soccer game between Portugal and Gisele's home country of Brazil.
Britney Spears  and Mario Lopez traded dolls during an Extra interview.
Mindy Kaling made a stylish appearance on the Today show.
Ashley Tisdale  showed off her gym style.
Beyoncé took some time out of her busy tour schedule to hit the beach in Brazil.
Justin Timberlake  shared photos from his Runner, Runner press stop in Rio de Janiero.
James Blunt stopped by the POPSUGAR NYC office for an interview and an ice-cold beer.
British babes Sienna Miller , Poppy Delevingne, and Mary Charteris had a night out on the town for the AnOther Magazine dinner in London.
Debra Messing  took a sultry selfie for her fans.
Behati Prinsloo wasn't too thrilled about her super-early call time for a Victoria's Secret shoot.
Brandy snapped a smiley selfie while getting a pedicure.
Oprah cooked up homemade dog treats for her pups.
Whitney Cummings snuggled in bed with her pooch.
Ciara made a special stop at the Ellen show.
Doutzen Kroes spent some quality time with her hubby, Sunnery James.
Sofia Vergara and her fiancée, Nick Loeb, attended a New York Giants game together.
Doutzen Kroes passed the time while getting her hair done by snapping a selfie for her followers.
Drew Barrymore  picked up a souvenir t-shirt at a recent Best Coast concert.
Jessica Biel  got a special delivery of blooms from Elle creative director Joe Zee.
Chrissy Teigen planted a sweet smooch on her new husband, John Legend , during their honeymoon in Portofino, Italy.
Harry Styles stopped for photos while taking in shows at London Fashion Week.
Models Lily Aldridge and Izabel Goulart went black on black for a night on the town.
Miranda Kerr  broke in her new eco-friendly blowdryer by Harry Josh.
Lena Dunham tried out a bold new look by wearing a bra on her head.
Mike Tyson and Jake Gyllenhaal  took photos together backstage before their appearances on Live! With Kelly and Michael.
The boys of Glee — Darren Criss, Jacob Artist, Blake Jenner, and Chord Overstreet — looked dapper in sleek suits while filming the show's Beatles tribute.
Bar Refaeli  tried on a lion suit.
Julianne Hough and Nina Dobrev  squeezed in some BFF time together.
Alessandra Ambrosio and a girlfriend made the most of their time in Paris.
Rosie Huntington-Whiteley cuddled with a cute pup.
Kate Upton looked fresh-faced on set.
Rachel Zoe  and Rodger Berman posed with their son, Skyler, before the little one's first day of school.
Nicole Richie  had a night out with friends Jennifer Meyer and Erin Foster.