Instagram was overflowing with candid celebrity pictures this week, and stars were basking in the spoils of all their hard work. Neil Patrick Harris  took his preparation for Walt Disney World seriously (fanny pack and all), and Britney Spears  gave us an up-close look at her own recent photo shoot. Heidi Klum  and Alessandra Ambrosio, meanwhile, paired up with the American Red Cross for a good cause, and Taylor Swift  was full of awe during her tour stop in Australia.
Click through to see the rest of this week's cutest celebrity candids, and be sure to follow POPSUGAR on Instagram , Facebook , and Twitter !
North West and Jeff Koons made each other's acquaintance.
Ludaris fondly remembered his late friend and colleague Paul Walker .
Rihanna  and Katy Perry  had what looked like a fun-filled reunion.
Neil Patrick Harris  was well prepared for his day at Disney World.
Adrian Grenier  got in touch with his inner artist.
Vanessa Hudgens  mimicked a much grungier version of herself.
Chrissy Teigen squeezed in a little time at the Happiest Place on Earth with her friends.
Ashley Benson got into character for a new role.
Gisele and her daughter, Vivian, squeezed in a yoga session.
Mariah Carey  prepared to kick off the Christmas season in NYC!
Tyra Banks  geared up for another cycle of America's Next Top Model.
Britney Spears  shared the results of a recent photo shoot.
Taylor Swift  soaked up the sun while making a tour stop down under.
Hilary Duff  was all smiles with a young fan.
Miley Cyrus  made time for piano practice.
Miranda Kerr  gave us a sneak peek of her new ad campaign with ShopStyle!
Kylie Jenner got pensive with a black and white filter.
Blue Ivy Carter rocked a leather jacket and Dr. Martens.
Naya Rivera looked like she was ready to be Santa's Little Helper.
Lea Michele  snapped a picture with the cover art for her upcoming album.
Kelly Osbourne rocked a crazy, purple-hued updo.
Sofia Vergara was #bombshelling for her new CoverGirl campaign.
Busy Philipps was stoked to get back to work on Cougar Town.
Lindsay Lohan  posed in her swimsuit.
Heidi Klum  and Alessandra Ambrosio joined forces for a good cause.
Christina  Milian made a goofy face.
Lady Gaga  went all out for her anime-inspired outfit in Japan.
Bar Refaeli  had a little family and canine fun.
Alessandra Ambrosio took to the beach for relaxation and sunshine.
Lance Bass prepared to take his Dirty Pop Live show on the go.