Star Tracks: Tuesday, April 21, 2015

Mom-to-be (again!) Ashlee Simpson and her husband, Evan Ross, attend a special screening of Just Before I Go in Hollywood on Monday.

Friends on-screen and IRL Courteney Cox and Jennifer Aniston also get together at the Just Before I Go screening (Cox directed) on Monday.

At Monday's Performance Space 122 2015 Spring Gala in N.Y.C. honoring Claire Danes, the woman of the hour speaks on stage.

LL Cool J and Jimmy Fallon goof off at a Monday taping of The Tonight Show in New York City.

Fresh off their ACM Awards presenting gig, Hot Pursuit stars Reese Witherspoon and Sofia Vergara keep the good times rolling Monday, surprising fans at a Miami screening of their new film.

Comedian Amy Schumer is sleek and svelte in a black dress and metallic heels on the way into the Late Show with David Letterman in N.Y.C. on Monday.

Jerry O'Connell plants on one wife Rebecca Romijn at Monday's opening-night performance of his musical Living on Love on Broadway.

Also there: costar Anna Chlumsky, who goofs off outside the after-party at Sardi's restaurant in N.Y.C. on Monday.

He's played a boxer on-screen, but Sylvester Stallone has muscle in real life, too! The Rocky actor shows off his guns while out in Beverly Hills on Monday.

The Walking Dead's Melissa McBride, Andrew Lincoln and Norman Reedus wrap their arms around each other at the show's ATAS FYC event on Monday in L.A.

Jake Gyllenhaal takes Atticus, his German Shepard, for a walk in L.A. on Monday.

Sarah Hyland and Extra host Mario Lopez share a laugh during the Modern Family star's appearance on the show at Universal Studios Hollywood on Monday.

Chris Hemsworth strikes an imposing pose on the U.K. set of his upcoming film The Huntsman (a prequel to 2012's Snow White and the Huntsman) on Monday.

All that dancing is hard work! Rumer Willis takes a break from DWTS rehearsals to read a book by the pool in L.A. on Monday.

Sharon Stone spreads the love while running errands on Monday in Beverly Hills.

Cobie Smulders makes mixing prints look easy in head-to-toe Chanel at the Tribeca Film Festival Chanel Artists Dinner in N.Y.C. on Monday.

Michael B. Jordan flashes his signature smile on his way into the Jimmy Kimmel Live studios in Hollywood on Monday.

Renée Zellweger brings boyfriend Doyle Bramhall as her date to Monday night's One Starry Night: From Broadway to Hollywood event for the ALS Foundation at the Pasadena Playhouse.

Rita Ora stays dry while walking through the drizzle in N.Y.C.'s SoHo neighborhood on Monday.

Actresses Maisie Williams and Florence Pugh are joined at the hip at the gala screening of their film The Falling in London on Monday.

You can do it, Uzo! Orange Is the New Black's Aduba keeps it moving on Monday while running the Boston Marathon. "That's where I grew up, where I learned what a marathon even was," she told PEOPLE of returning to her hometown of Boston. "To be a part of it, it feels particularly special."

New mom Hayden Panettiere brightens up a rainy Monday in head-to-toe pink while visiting Good Morning America in N.Y.C.

Tom Hardy, is that you? The nearly unrecognizable Mad Max: Fury Road actor walks through London's Heathrow airport on Monday.

Walking the red carpet in a pleated dress, Salma Hayek poses for pictures Monday at the Woman Magazine Awards in Madrid, Spain.

Olivia Munn leaves Lemonade restaurant in L.A. – with, you guessed it, lemonade! – and takes her dog, Chance, for a walk on Monday.

Arrow actress Katie Cassidy catches some rays on Monday in a funky mismatched bikini while strolling on a Miami beach.