Can't-Miss Celebrity Pics!

Beyoncé was in a chipper mood in NYC on Thursday.

Reese Witherspoon headed out in Beverly Hills, CA, in style on Thursday.

Alicia Keys and Swizz Beatz brought adorable PDA to her Keep A Child Alive organization's Black Ball in NYC on Thursday.

Suki Waterhouse attended the UNICEF Halloween Ball in London on Thursday, joining all the stars who debuted new costumes before Halloween.

On Thursday, Robert Downey Jr. shared a sweet moment with his wife, Susan Downey, on the red carpet at BAFTA's Britannia Awards in LA.

Queen Elizabeth II and Prince Philip toured a Jaguar and Land Rover factory in Wolverhampton, England, on Thursday.

Jason Derulo flashed his abs while performing in Atlanta on Thursday.

Costars Maggie Gyllenhaal and Ewan McGregor embraced at the opening night of The Real Thing on Broadway in NYC on Thursday.

Ariana Grande went shopping for a Halloween store in her hometown of Boca Raton, FL, on Wednesday.

Kate Bosworth and Michael Polish made their way through LAX with a smile on Thursday.

Rita Ora was covered up in London on Thursday.

Daniel Radcliffe hit the red carpet at the premiere of Horns in LA on Thursday.

Chris Hemsworth and Elsa Pataky cuddled up on Thursday at the Foxtel season launch in Sydney, Australia.

Taylor Swift took the stage in NYC on Thursday.

Allison Williams glowed at the NYC press junket for Peter Pan Live! on Thursday.

Josh Duhamel was all smiles on Wednesday at LAX.

Jared Leto rocked a fanny pack on Wednesday in NYC.

Rashida Jones attended Thursday's Marie Claire New Guard Lunch in LA.

Nick Jonas showed up on the LA set of Extra on Thursday.

Kaley Cuoco got a star on the Hollywood Walk of Fame on Wednesday.

Jennifer Lopez got all glammed up in LA on Wednesday.

Lena Dunham continued her book signing tour on Wednesday in London.

On Wednesday, Prince Harry attended a memorial service in London.

Hilary Duff spent her Wednesday on the NYC set of Younger.

Matthew McConaughey, Jessica Chastain, and Anne Hathaway made for a gorgeous trio at London's Wednesday night Interstellar premiere.

Alessandra Ambrosio and Jared Leto showed off their enviable locks at the Rimowa store opening in NYC on Tuesday.

Kate Moss took control of the DJ booth during an event for Annabel's London on Tuesday.

Eddie Redmayne and Felicity Jones were a gorgeous pair at the LA screening of The Theory of Everything on Tuesday.

Former SNL cohorts Amy Poehler and Seth Meyers met up for a radio talk in NYC on Tuesday.

Ben Affleck looked buff out in LA on Tuesday.

Andrew Garfield walked the streets of NYC on Tuesday.

Jake Gyllenhaal stepped out of his trailer on the NYC set of Demolition on Tuesday.

Reese Witherspoon smiled big after lunch at LA's Tavern on Monday.

Channing Tatum was busting out of his t-shirt in Savannah, GA, on Sunday.

Mom-to-be Carrie Underwood wore a pretty blue dress for a taping of The View in NYC on Monday.

Anne Hathaway and Jessica Chastain shared a sweet moment at the LA premiere of Interstellar on Sunday.

Matthew McConaughey and Camila Alves made a stunning couple at the Interstellar premiere in LA on Sunday.

King Felipe of Spain met with children in Madrid on Monday.

Beyoncé and Solange Knowles were silly and stylish at the Prospect 3 Fair in New Orleans on Sunday.

Kate Walsh wore a nude bikini while filming Bad Judge in LA on Monday.

Juno Temple and Heather Graham posed for a photo at the Monday night premiere of Horns in NYC.

Jessica Chastain waved to cameras as she made her way through LAX on Monday.

Taylor Swift greeted fans in NYC on Monday.

Matthew McConaughey and his wife, Camila Alves, landed at LAX holding hands on Monday.

Nikki Reed carried a Henri Bendel bag while running errands in LA on Monday.

Shirtless and smiley Adrian Grenier hit a Miami beach on Tuesday.

Alec Baldwin gave Neil Patrick Harris a serious lift on the red carpet at Elton John's annual AIDS Foundation Benefit in NYC on Tuesday.

Kristen Stewart made a Wednesday market run in LA.

Madonna, Kanye West, and Riccardo Tisci struck a selfie pose at Keep a Child Alive's Black Ball in NYC on Thursday.