1 of 20
2 of 20
3 of 20
WORK & PLAY
Why so serious, Mark? Wahlberg keeps his cool next to a goofy Dwayne "The Rock" Johnson while in Las Vegas for Monday's Paramount presentation at CinemaCon.
4 of 20
5 of 20
Beyoncé leads the crowd in a high-energy sing-along while performing at Barcelona's Palau Sant Jordi arena on Monday.
6 of 20
PLAN OF ACTION
Elizabeth Olsen prepares for battle while filming Avengers: Age of Ultron on location in Aosta, Italy, on Monday.
7 of 20
Nikki Reed and hubby Paul McDonald sport matching smiles (and shades!) while out together Monday in Beverly Hills.
8 of 20
9 of 20
TRIPLE OR NOTHING!
Julia Louis-Dreyfus only has eyes for costar Tony Hale while celebrating the third season of Veep at Monday's Hollywood premiere of their HBO series.
10 of 20
ALL THAT GLITTERS
Lady Gaga thinks pink (and sparkly!) as she stops by New York City's Z100 radio station on Monday.
11 of 20
TALK IT OUT
Michael Sheen stays on point during an animated discussion with Masters of Sex costar Lizzy Caplan at The Paley Center for Media's PaleyFest 2014 panel Monday night in Hollywood.
12 of 20
Emmy Rossum dresses up her flirty polka-dot ensemble with a matching scarf and shades while running errands Monday in L.A.
13 of 20
ROLL WITH IT
Is he kicking off a new career? Funnyman Will Arnett Segways onto the stage Monday to introduce the world premiere of his action flick remake Teenage Mutant Ninja Turtles during the opening night of CinemaCon 2014 in Las Vegas.
14 of 20
Blake Lively pairs her winter wear with – what else? – sandals while working Monday on the Vancouver, Canada, set of her upcoming drama, The Age of Adaline.
15 of 20
Teen models Ireland Baldwin and Gigi Hadid (daughter of Real Housewives of Beverly Hills star Yolanda Foster) are linked in during a day trip to Disneyland in Anaheim, Calif., on Monday.
16 of 20
Joe Manganiello raises the temperature in chilly New York City, strutting his stuff on his way to the SiriusXM studios on Monday.
17 of 20
18 of 20
Ricky Gervais shares a laugh with his green pal Constantine Monday at the VIP screening of Muppets Most Wanted at the Curzon Mayfair in London, England.
19 of 20
WHAT'S YOUR POINT?
We didn't do it! Nick Cannon points a finger while visiting The Morning Show Monday in Toronto, Canada.
20 of 20
The boys are back! Kevin Dillon and Jerry Ferrara – a.k.a. Johnny Drama and Turtle – cruise through a scene of the Entourage movie on set in L.A. on Monday.