Celeb Sightings! See Where Your Favorite Stars Hung Out This Week

Whitney Port at the 3rd Annual BeautyCon Summit presented by ELLE

Whitney Port stepping out for the 3rd Annual BeautyCon Summit presented by ELLE Magazine at Pier 36 in NYC.

Nicolas Cage announcing Axl Rose and Guns N' Roses — who were guzzling Beau Joie champagne and Casamigos tequila! — at Beacher's Madhouse at the MGM Grand in Las Vegas.

Bethenny Frankel and boyfriend Mac Cerussi – nicknamed Macbeth! – having dinner at Harlow restaurant in Sag Harbor, NY.

Lena Dunham ordering a carrot, beet and ginger smoothie at The Bedford in Brooklyn.

Karina Smirnoff sipping TY KU cocktails at the Dancing With the Stars Wrap Party in L.A.

Rosario Dawson supporting Hollywood Domino at their Dancing Spies Ball benefitting PCI Media Impact in Cannes, France.

Macklemore dining on a pretzel panini and truffle fries with a friend at David Burke at Bloomingdale's in NYC.

Ethan Hawke and wife Ryan Hawke hosting a book release party for Anna Godbersen's The Blonde at their home in NYC.

Lady Gaga getting up close and personal with fans who won the Absolut Gaga contest at her ArtRave tour stop in Edmonton, Canada.

Austin Mahone performing songs off his new EP, The Secret, at the launch of the Billboard Twitter Real-Time Charts in NYC.

Mark Ballas celebrating his birthday with pals Cheryl Burke, Nikki Reed and Derek Hough over dinner at Katsuya in Hollywood.

Ryan Seacrest hanging in the DJ booth at the new Drai's Nightclub with Victor Drai and DJ Eric Prydz inside The Cromwell, the first stand-alone boutique hotel on the Las Vegas strip.

Arnold Schwarzenegger and Maria Shriver turning up for the friends and family opening event of son Patrick Schwarzenegger's new restaurant Blaze Pizza in the Original Farmer's Market in L.A.

Katie Holmes picking up frozen yogurt with daughter Suri at 16 Handles – who just launched the special edition flavor Caramel Popcorn Finale for the Tony Awards – in NYC.

–A newly single Nick Loeb spending Memorial Day Weekend with a guy friend at Don Julio’s StadiumRed Estate BBQ in Sag Harbor, NY.

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