Nick Lachey and Vanessa Minnillo Celebrate Derby Day

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Nick Lachey and Vanessa Minnillo cuddling at the Greenhouse/Playboy party at the Kentucky Derby in Louisville.

Susan Surandon eating the $24.07 prix fixe lunch menu with rumored beau Jonathan Bricklin at Tao in NYC.

Aubrey O'Day hanging out with friends at Veranda in NYC.

See the day's top celeb pics.

Chelsea Handler grabbing cappuccino with a girlfriend at LGO in Santa Monica.

Lisa Ling chatting with friends at the LUCKYRICE Festival's Grand Feast at the Mandarin Oriental in NYC.

Stephanie Pratt sipping champagne at Stingaree in San Diego.

Christian Louboutin and Lucy Liu having dinner at Le Caprice in NYC.

Matthew McConaughey enjoying the Milagro "World's Freshest Margarita" in Austin.

Hilary Swank having pasta and a martini at Delphine Brasserie in West Hollywood.

David Arquette sipping Don Julio at the afterparty of the Mercy premiere in L.A.

Kate Hudson showing off her new physique at Chopard's 150th anniversary fete at the Frick Collection in NYC.

Mom-to-be Danica McKellar chatting with Trista Sutter at the Pregnancy Awareness Month event at TreePeople in L.A.

Avril Lavigne talking to Nancy Davis at the Race to Erase MS Kitson Fundraiser in L.A.

Gwyneth Paltrow asking alice + olivia designer Stacey Bendet about the performers Caitlin Moe and DJ Mia Moretti at the Bent on Learning event in NYC.

Bridget Marquardt party hopping between clubs Angels Rock Bar, Tengo and Hotel in the Fourth Street Live! District of Louisville, Kentucky.

Chris Brown hanging out with boxer Andre Berto at Rehab at the Hard Rock hotel in Las Vegas.

Kelly Bensimon celebrating her 42nd birthday sipping Moet Rose champagne at Set in Miami.

Molly Sims having coffee with milk and Splenda at NYC's Bryant Park Hotel to celebrate the launch of

Brittany Snow catching up with Jessica Stroup at the Dyson Air Multiplier Presents Tyler Shields' Collisions event in L.A.

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