Star Tracks: Kourtney Kardashian & Boyfriend Younes Enjoy a Night Out, Plus Prince Harry, Gigi Hadid & More

Miles Teller and fiancée Keleigh Sperry attend the Cinema Society & Avion screening of the actor's new film, Thank You for Your Service at The Landmark in N.Y.C.

Wearing a cheeky "Gym and Tonic" tee, a smiling Rachel Bilson heads to the California Science Center with her mom and daughter Briar Rose (not pictured) on Wednesday.

On Wednesday, Jason Bateman gets animated during Game 2 of the 2017 World Series between the Houston Astros and the Los Angeles Dodgers.

Stranger Things actress Millie Bobby Brown takes a page out of Kaia and Presley Gerber's book and channels her inner supermodel at the CFDA/Vogue Fashion Fund Show on Wednesday.

Former First Lady Michelle Obama and host David Letterman have a conversation onstage at The Streicker Center on Wednesday in N.Y.C.

Dancing with the Stars' Jordan Fisher poses with Mario to celebrate the launch of Super Mario Odyssey at Rockefeller Plaza on Oct. 26.

Laverne Cox and Brittany Snow strike poses at the CFDA/Vogue Fashion Fund Show in L.A.

A casually dressed Justin Theroux spends his Wednesday in N.Y.C.

Bachelor star Corinne Olympios can't help but laugh when confronted with Jigsaw characters at the film's Hollywood premiere on Wednesday.

Talk about squad goals! Connie Britton, Chelsea Handler, Sophia Bush and Zoe Lister-Jones regroup for the International Women's Media Foundation 2017 Courage In Journalism Awards.

Mila Kunis watches Game 2 of the World Series with her father on Wednesday at L.A.'s Dodger Stadium.

David Beckham and son Romeo attend the Lakers vs. Wizards game in Los Angeles on Wednesday.

Mike Rosenthal high fives John Legend as the Dodgers face the Astros in the World Series on Wednesday.

Prince Harry is presented with flowers as he arrives at a conference in Copenhagen Thursday.

Gigi Hadid is spotted rocking a NASA jumpsuit Wednesday in New York City.

On Thursday in London, Ruth Negga and boyfriend Dominic Cooper wear matching beanies during a day out.

Iman comes out for a Wednesday Jay Manuel Beauty event in N.Y.C.

Emily Ratajkowski smiles on a Los Angeles movie set.

Lori Loughlin and daughter Olivia Jade Giannulli check out Kourtney Kardashian's PrettyLittleThings launch party in L.A.

Finn Cole and Margot Robbie are seen in action on the Dreamland set in New Mexico on Tuesday.

Kourtney Kardashian enlists boyfriend Younes Bendjima as her date to the PrettyLittleThings launch in West Hollywood.

An expectant Jessica Alba exits her New York City hotel on Wednesday.

Anna Kendrick shows every bit of holiday cheer as she slips into the titular role of Nicole in Disney's female-driven Santa Claus film on the movie's Vancouver set.

Following her picture-perfect honeymoon with new husband Michael Fassbender, Alicia Vikander is spotted at a Miami airport.

Prince Harry is all smiles during a visit to GAME, which uses sports to create lasting social change and inspires people to become local community role models, in Copenhagen, Denmark.

Orlando Bloom goes for a bike ride with his pup while visiting Prague.

A few days after releasing his debut solo album, Niall Horan hits a high note during a performance on Hits 1 at the SiriusXM Studios in New York City on Wednesday.

On Wednesday, Mark Wahlberg stops by Despierta América to discuss his new film, Daddy's Home 2, on Wednesday.

Lady Gaga channels her inner old Hollywood siren with a coiffed bob and hot pants while out and about in L.A. on Tuesday.

Colton Haynes continues his tradition of wearing elaborate Halloween costumes as he celebrated the upcoming holiday in an over-the-top Marge Simpson look alongside Aisha Tyler as The Walking Dead's Negan at the Freixenet party at La Descarga on Tuesday.

Gavin Rossdale takes his furry friend for a stroll around Studio City, California, on Tuesday.

Kendall Jenner masters the off-duty model look thanks to big sunglasses and sleek leggings in New York City on Tuesday.

Stranger Things star Gaten Matarazzo hams it up for photographers after leaving dinner with his family on Tuesday in L.A.

Lily-Rose Depp strikes a pose as she arrives at the 2017 WWD Honors on Tuesday in New York.

Prince Harry is all smiles as he meets with Queen Margrethe II at Amalienborg Palace in Copenhagen, Denmark, on Wednesday.

Jaime King walks the runway during the fashion show at the PAPER Magazine Runway Benefit For Make-A-Wish Foundation on Tuesday.

Prince Jackson and sister Paris enjoy some brother-sister bonding time as they attend the mothers2mothers and The Elizabeth Taylor AIDS Foundation Benefit Dinner on Tuesday in Beverly Hills.

On Tuesday, John Stamos and newly-minted fiancée Caitlin McHugh attend the mothers2mothers and The Elizabeth Taylor AIDS Foundation Benefit Dinner.

Katharine McPhee is spotted on the L.A. set of Scorpion on Tuesday.

Jessica Simpson and daughter Maxwell greet Princess Charlene of Monaco with a bouquet of flowers at the 2017 Princess Grace Awards Gala Kick Off Event.

Power couple David and Victoria Beckham come out to support friend Eva Longoria as she hosts the grand opening of the new Ken Paves Salon.

The Weeknd riles up the crowd during his performance at Miami's American Airlines Arena on Tuesday.

S.W.A.T.'s Shemar Moore gives his costar, Lina Esco, a boost during the world premiere of their new show on Tuesday in N.Y.C.

Rob Lowe waves the Dodger flag on top of the Houston Astros dugout during game one of the World Series on Tuesday.

Sean Penn makes a speech at the Nashville Shines for Haiti event, which benefits the actor's J/P Haitian relief organization on Tuesday.

Carrie Underwood and husband Mike Fisher come together attend to attend the Nashville Shines for Haiti event on Tuesday.

Jennifer Garner gears up to break a sweat during a Tuesday morning workout.

Gail Simmons visits the SiriusXM Studios on Tuesday in N.Y.C.

Liam Hemsworth enjoys a day at the beach during a day off from shooting his new film, Killerman, in Savannah, Georgia.

So sweet! Mariska Hargitay and Brooke Shields hug it out on the N.Y.C. set of Law & Order: SVU.

Patti LaBelle performs at Foxwoods Resorts Casino on Saturday.

Ryan Gosling is unrecognizable as he channels his inner cowboy on the Atlanta set of First Man.

Stella Maxwell perfects her yoga pose while participating in a Train Like An Angel event, ahead of the Victoria's Secret Fashion Show, on Tuesday.

Real Housewives of New York City alumna Kelly Bensimon is all smiles as she and her pup go for a stroll on Monday.

Elle Fanning and Brie Larson pull out all the style stops at the InStyhle Awards on Monday.

Cate Blanchett takes the stage to accept the Style Icon Award at the third annual InStyle Awards on Monday.

Ben Schwartz attends the Visa ID Intelligence launch party at Money 20/20 on Monday.

Ahead of their Netflix show's season 2 premiere, Stranger Things stars Dacre Montgomery, Natalia Dyer and Joe Keery stop by Young Hollywood Studio on Monday in L.A.

Zendaya is a vision as she makes her way down the InStyle Awards red carpet on Monday in L.A.

Reunited — and it feels so good! Selena Gomez and Demi Lovato catch up and pose for photos together at the third annual InStyle Awards on Monday.

Former One Direction member Niall Horan greets fans and photographers before heading to Jimmy Kimmel Live.

On Monday, Miles Teller and Haley Bennett arrive at the L.A. premiere of Thank You For Your Service.

Huddling together for a group photo, Gigi Hadid, sister Bella and mother Yolanda attend V Magazine's intimate dinner in honor of designer Karl Lagerfeld.

BFFs Jennifer Lopez and Leah Remini have some fun on the Queens, New York set of their new film, Second Act.

Jaimie Alexander shares an embrace with her stunt double, Heidi Schnappauf at the 10th Annual Action Icon Awards on Sunday.

Liev Schreiber keeps his pup close during a bike ride through New York City's Soho neighborhood.