Hayden Panettiere Hangs Out in Chicago

-- Hayden Panettiere hanging out with tattoo artist Johnny McDevitt at Express Rocks! at the Music Cafe at the Hard Rock Hotel in Chicago.

-- Black Eyed Peas frontman Will.I.Am taking over the DJ booth at the Pool After Dark at Harrah’s Resort Atlantic City.

-- Elisabeth Rohm enjoying ESPA spa treatments at Acqualina Resort & Spa on the Beach in Miami Beach.

-- Jill Zarin eating two chocolate covered roses at Sugar Factory in Las Vegas.

PHOTOS: Today's top celebrity pics

-- Brody Jenner sipping a Bud Light at La Brea Studios in L.A.

-- Jessica Szohr and Ed Westwick watching the Black Keys perform at the TOM Shoes sponsored concert at the Hotel Sax in Chicago.

-- Gabe Saporta and Shannen Doherty judging a regional competition as part of GQ magazine and Bombay Sapphire's search for the nation's "most inspired" bartender at Trump Soho Hotel's rooftop bar in NYC.

-- Anthony Mackie chatting with friends at the launch of Marc Ecko's fall collection in New York City.

-- Kanye West, O'Neal McKnight and Marc Jacobs spending thousands of dollars at the Prada and Adidas stores in NYC.

-- David Arquette and Neve Campbell grabbing a quick bite at HUB51 before catching the late-night Phoenix concert at House of Blues, Chicago.

-- M.C. Hammer getting into the DJ booth at the TalentMaven.com launch party at Hudson Terrace in NYC.

-- Julia Roberts enjoying creme brulee while discussing her new movie with friends at Paris Commune in NYC.

PHOTOS: Hands-on celebrity moms

-- Green Day bandmembers playing with the new Samsung Galaxy S smartphone during dinner at Sunda in Chicago.

-- Shania Twain meeting her long-time stylist Frankie Foye at the Hair Rules salon in NYC.

-- Emma Watson showing off her new pixie haircut at Indochine in NYC.

-- Karina Smirnoff dancing at the Schick Intuition Plus KISS & Tell Party at Stone Rose in NYC.

-- Donna Karan chatting with fashion designer Stacy Igel at Super Saturday in Water Mill, NY.