Star Tracks: Monday, Dec. 5, 2016
Sienna Miller is a vision in a blush pink ensemble at the 2017 Breakthrough Prize at NASA Ames Research Center on Sunday.
Reunited and it feels so good! Michelle Williams and her Dawson's Creek costar James Van Der Beek come together at the Manchester by the Sea holiday party on Saturday.
Office Christmas Party star T.J. Miller goes all-in for the holiday season at the SiriusXM Studios in New York City on Monday.
MAN AT WORK
Rupert Grint is hard at work on the Manchester City, England set of his new movie Snatch.
THIS IS NOT A GAME
Leading man Michael Fassbender poses at a photocall for his new film Assassin's Creed Monday in Paris, France.
Karlie Kloss delivers a smoldering look as she attends The Fashion Awards on Monday in London.
MADE FOR A MODEL
A statuesque Gigi Hadid sports a structured look at The Fashion Awards 2016 in London on Monday.
A LOOK BACK
Donning color-coordinated outfits, Emma Roberts and Evan Peters walk together in L.A.
Real Housewives of New York's Bethenny Frankel shows off her super-toned body as she soaks up the sun in Miami Beach.
ANGEL AMONG US
Victoria's Secret Fashion Angel Adriana Lima stops by AOL Build on Monday in N.Y.C.
ON TOP OF THE WORLD
On day 13 of his trip to the Caribbean, Prince Harry visits the iconic Kaieteur Falls in Surama, Guyana on Saturday.
WHAT A CATCH
Selena Gomez is back in black! The singer heads to L.A.'s Catch restaurant for dinner.
Victoria Justice shows off her style game while walking through N.Y.C.'s Soho neighborhood on Sunday.
This Is Us actress Chrissy Metz poses alongside Dancing with the Stars pro Derek Hough at the Brook Brothers holiday celebration with St. Jude's Research Hospital on Saturday in Beverly Hills.
Mariah Carey and rumored new flame Bryan Tanaka cozy up at Sunday's Mariah's World viewing party in N.Y.C.
ALL IN THE FAMILY
Maria Shriver clocks in some bonding time with her daughters Christina and Katherine at the Manchester by the Sea holiday party on Saturday in L.A.
FOR THE LOVE OF ART
On Saturday, Madonna and son David head to the singer's "Evening of Music, Art, Mischief and Performance to Benefit Raising Malawi" event in Miami Beach on Saturday.
Lindsey Vonn, Molly Shannon and Kate Beckinsale get cozy at a Manchester by the Sea holiday party on Saturday in L.A.
THE GOOD LIFE
Kendall Jenner enjoys a glass of wine Sunday in Miami.
WOMAN IN THE MOON
Lady Gaga takes the stage Sunday at The X Factor Live Finals.
A pouting Karolina Kurkova supports Ian Somerhalder at his Foundation Benefit Gala on Saturday in Chicago, Illinois.
Jay Duplass and Kathryn Hahn pose at the TrevorLIVE Los Angeles fundraiser on Sunday.
TIME TO PARTY
Jennifer Morrison attends the Brook Brothers holiday celebration with St. Jude Children's Research hospital on Saturday in Beverly Hills.
Darren Criss puts his paws up with Cats stars Mamie Parris and Tyler Hanes backstage at the Saturday show in N.Y.C.
Sunday in New York City, Dakota Fanning is accompanied by a mystery man as she makes her way around town.
Bethenny Frankel rocks a coral bikini in Miami on Saturday.
YOU ARE WHAT YOU EAT
Dear Evan Hansen star Ben Platt meets his cake likeness at the musical's opening night party Sunday in N.Y.C.
Ansel Elgort and girlfriend Violetta Komyshan are all smiles at Friday's Knicks vs. Timberwolves game in N.Y.C.
On Saturday, Prince Harry visited Joshua House Children's Centre in Georgetown, Guyana, for a final stop in his royal tour of the Caribbean.
GIRL ON FILM
Jessica Chastain attended the the Cinema Society and Piaget's afterparty for EuropaCorp's Miss Sloane in New York City on Saturday.
PRETTY IN PINK
Naomi Campbell attends the Fashion Awards in partnership with Swarovski nominees' lunch hosted by the British Fashion Council with Grey Goose at Little House Mayfair in London on Saturday.
Matthew McConaughey and Reese Witherspoon attended the premiere of Sing in Los Angeles on Saturday.
Anne Hathaway was spotted filming Ocean's Eight in New York City on Saturday.
DO YOU BELIEB?
Justin Bieber performed at the 102.7 KIIS FM's Jingle Ball 2016 presented by Capital One at Staples Center in Los Angeles on Friday.
Freida Pinto attended the gala dinner as The Business of Fashion Presents VOICES in Oxfordshire, England, on Friday.
Bethenny Frankel wore a coral bikini during a beach stroll in Miami.
SIDE TO SIDE
Ariana Grande performed onstage during Madonna presents An Evening of Music, Art, Mischief and Performance to benefit Raising Malawi at Faena Forum in Miami.
Britney Spears got a birthday cake while performing onstage at the 102.7 KIIS FM's Jingle Ball 2016 in Los Angeles on Friday.
Fresh off the Victoria's Secret Fashion Show runway, Alessandra Ambrosio stops by Extra on Friday.
NO PLAYING GAMES
Games of Thrones actress Sophie Turner attends London's Women in Film and Television Awards on Friday.
BABY ON BOARD
Parents-to-be Thomas Sadoski and Amanda Seyfried enjoy an afternoon stroll while they walk their dog in N.Y.C. on Friday.
WORK IT OUT
Elle Macpherson is all smiles as she leaves the gym after a workout in Miami on Friday.
Following her performance at the Victoria's Secret Fashion Show, Lady Gaga is spotted out and about in London on Friday.
Tom Hiddleston is all smiles as he celebrates director Amanda Nevill, at the Women in Film and Television Awards in London on Friday.
Mariah Carey sparkles in a shimmery dress as she leaves dinner in N.Y.C.
A CHRISTMAS CAROL
President Barack Obama, Eva Longoria and Santa Claus serenade the crowd gathered at the National Christmas Tree Lighting in Washington D.C. with a rendition of "Jingle Bells" on Thursday.
Victoria Justice shows off her posing skills as she goofs around at the Lord & Taylor Stamford Grand Re-Opening celebration in Connecticut on Thursday.
Tyson Beckford strikes a pose at the Public School after party for the launch of WNL Radio in Miami on Thursday.
GOT THE BLUES
Rosario Dawson shows off her color-coordinated outfit as she poses for photos at the 7th Annual Bombay Sapphire Artisan Series Finale in Miami on Thursday.
Lady Gaga strikes a pose while taking a selfie with a crowd of adoring fans after a surprise performance in London on Thursday.
BACK IN BLACK
Jennifer Morrison, Keke Palmer and new mom Jurnee Smollett-Bell cozy up for a picture at Thursday's Beat The Odds Awards in Beverly Hills, which are hosted by the Children's Defense Fund.
PUT YOUR HANDS UP
Hailee Steinfeld shows off her dance moves as she performs at WiLD 94.9's FM's Jingle Ball in San Jose, California on Thursday.
HEAR ME OUT
Jimmy Fallon grabs the mic as he and Emma Stone play the "Whisper Challenge" during a taping of The Tonight Show on Thursday.
HIT THE RUNWAY
Emily Ratajkowski struts her stuff as she makes her way through LAX Airport on Thursday.
TIME TO PARTY
Vin Diesel and his xXx: Return of Xander Cage costar, Nina Dobrev, take the stage at Villa Mix Nightclub in São Paulo, Brazil on Thursday.
Sandra Bullock is ever-cool as she rocks dark shades while on the N.Y.C. set of Ocean's 8 on Thursday.
WALK IT OUT
Kurt Russell walks his dog in L.A.
Joanna Krupa is in puppy love! The Real Housewives of Miami star heads to the Become the Dog Angel Auction in Warsaw, Poland on Thursday.
PLEASURE TO MEET YOU
Eddie Redmayne meets with Queen Elizabeth to receive his Officer of the Most Excellent Order of the British Empire award (OBE), given for his services to drama, on Friday.
RED-Y TO SLAY
Andra Day gears up for a performance in N.Y.C. on Thursday.
FEELING THE 'LOVE'
Halle Berry stuns while attending Revlon's 2nd Annual Love Is On Million Dollar Challenge Finale Party on Thursday in N.Y.C.
CAUGHT IN THE MIDDLE
Chloë Sevigny keeps her pup warm as she braves N.Y.C.'s frigid temps on Thursday.
COOL GIRLS CLUB
Zelda Williams and Jaime King strike poses while attending Net-a-Porter's New Designers Cocktail event on Thursday in L.A.
Christie Brinkley toasts to the holidays with Santa Claus at the 93rd Annual New York Stock Exchange Christmas Tree Lighting event on Thursday.
Kate Hudson and Demi Moore celebrate with Gwyneth Paltrow at the opening of the Los Angeles Goop pop-up shop on Thursday.
Expectant mom Natalie Portman steps out in N.Y.C. on Thursday in a checkered jacket and scarf for extra warmth.
Shia LaBeouf stops at an L.A. gas station on Thursday.
As part of his tour of Caribbean, Prince Harry joins Rihanna at the 'Man Aware' event, held by the Barbados National HIV/AIDS Commission, in Bridgetown, Barbados on Thursday.
Jeremy Renner listens to his music while arriving at LAX Airport on Thursday.