Jennifer Hudson hosted a Weight Watchers Walk-It Challenge Tuesday afternoon (May 10) at the Namaste Charter School in her hometown of Chicago. The singer/actress also presented the Alliance for a Healthier Generation with a $100,000 check donated by Weight Weight Watchers.

Rapper Fabolous sat down with students from the Garden of Dreams Foundation for a “Fuse Rocks the Classroom” taping at Fuse Studios yesterday (Tue. May 10) in New York City.

“Gossip Girl” star Blake Lively attended the Chanel Collection Croisiere Show 2011-12 at the Hotel du Cap in Cap d’Antibes, France early Monday (May 9). Lively is among the many stars attending the Cannes Film Festival in France.

Shania Twain made an exclusive appearance for her book signing for “From This Moment On” Monday afternoon (May 9) at Indigo Manulife Centre in Toronto, Canada.

Actress Sanaa Lathan came out to the “By The Way, Meet Vera Stark” Off-Broadway Opening Night-After Party (May 9) at Trattoria Dopo Teatro in New York, NY.

Halle Berry was in attendance at the 18th Annual EIF Revlon Run/Walk For Women at eh Los Angeles Memorial Coliseum in Cali Saturday (May 7).

The entire Kardashian Klan, minus the little Jenner girls, were on hand for the City of Hope gala at Universal Studios in Hollywood Saturday evening (May 7). Pictured above from left to right is Bruce and Kris Jenner, and Kim, Khloe, Kourtney and Rob Kardashian.

Kelly Rowland was spotted Saturday (May 7) at Beso Steakhouse At Crystals CityCente in Las Vegas, Nevada.

Lauryn Hill performed during Day 6 of the 2011 New Orleans Jazz Festival in Louisiana Saturday afternoon (May 7).

And singer/songwriter Bruno Mars stopped by radio station Q102 in Pennsylvania Saturday afternoon (May 7) to talk about his “Hooligans in Wondaland” tour and perform a few singles from his successful debut album Doo Wops & Hooligans.