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

Sophia Bush
Sophia Bush  Christopher Neseman

Sophia Bush cheering on good friend Betty Who during her performance at the Gilt City Better Than Backstage Rooftop pool party during Lollapalooza weekend in Chicago.

Helen Mirren chatting with Oprah during a cast dinner at Monkey Bar after premiering their film The HundredFoot Journey at the Ziegfeld Theater in NYC.

Jimmy Fallon buying an array of Farm Candy products while shopping with his family at the Hamptons Collective in Bridgehampton, N.Y.

Tiffani Thiessen wearing her San Diego Hat Company's Raffia Stone Fedora during a family trip on the lake in Hill Country, Texas. 

–Rapper NAS giving a surprise performance featuring works by Shepard Fairey at the launch of his limited edition Hennessy V.S. bottle at the Art Alliance in Chicago.

Taylor Schilling sparkling in One Jewelry earrings at the Orange Is the New Black panel discussion in L.A. 

Jamie Foxx and Amber Rose twerking on stage and throwing back Ketel One cocktails to a special rendition of "Gold Digger" at the new Hyde Sunset Kitchen + Cocktails in L.A. 

Christina Milian rocking out to her new LG Electronics Bluetooth headset at Drais in Hollywood.

Nikki Reed working on her grocery list during the official launch of Vita Coco Coconut Oil at Haven's Kitchen in NYC.

Illumination Road, Grace Harris and Carly Tefft performing an acoustic rock night at the House of Blues' Voodoo Lounge in West Hollywood.

True Blood's Ryan Kwanten having a date night with girlfriend Ashley Sisino at a Beekeeper Wine Dinner at Del Frisco's Grille in Santa Monica, CA.

Megan Fox chatting with couture jewelry designer Margaret Rowe – wife of producer Bret Rowe – at the Teenage Mutant Ninja Turtles premiere in Westwood, CA.

–Irish actress Victoria Smurfit supporting her husband at the 10th Anniversary party of M&C Saatchi produced by The Admirable Crichton events in Santa Monica, CA.

Jay Glazer giving friend Michael Strahan a bottle of Johnnie Walker Blue Label to celebrate his Pro Football Hall of Fame induction in Canton, OH.

Robert De Niro sampling the tasting menu during a romantic dinner with wife Grace Hightower at The Musket Room in NYC.

–Don't stop believing! Constantine Maroulis returning to the Broadway stage in Rock of Ages in NYC.

Rascal Flatts admitting they've all suffered from frequent heartburn during a press day to promote their partnership with the new Nexium 24HR in NYC.

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