Access Star Sightings: October 16 - 22, 2009

Britney Spears and her son are spotted on October 22, 2009 in Los Angeles, CaliforniaFilmMagicAccess Hollywood

LOS ANGELES, Calif. -- Saturday, October 17, in Las Vegas: Taylor Swift shopping at Armani Exchange with her mom before lunch at Diablo's Cantina, before heading to her gig at Justin Timberlake's charity concert with a reunited TLC, Alicia Keys, Timbaland and Justin himself.

Sunday, October 18, in LA: Pauly Shore picking up a black suitcase at the Burbank Airport... Mark Walhberg stepping out for Starbucks on Mulholland and Beverly Glen... actors Chad Allen of Here TV's "The Donald Strachey Mysteries" and Luke MacFarlane of ABC's "Brothers & Sisters" spinning their wheels on a 200 mile charity bike ride to Santa Barbara and back, raising money for the Youth, Mental Health and Addition Recovery services department of the LA Gay & Lesbian Center.

VIEW THE PHOTOS: Week's Best Star Sightings: October 17 - 23, 2009

Tuesday, October 20, in LA: Leonardo DiCaprio in downtown LA's EVO, checking out the property's eco-friendly penthouses between shooting scenes with Ellen Page and Joseph-Gordon Levitt for Christopher Nolan's "Inception"... Aziz Ansari waiting in line for indie rockers Grizzly Bear's Hollywood Palladium concert ... and after the show, Michelle Williams, Busy Philipps, Pete Yorn and Devendra Banhart in good spirits at the after party.

Wednesday, October 21, in LA: "The Office" star Angela Kinsey hanging around the UCB Theater with "Hangover" star Rachel Harris.

VIEW THE PHOTOS: The Latest Star Sightings

Thursday, October 22, in NYC: Sienna Miller taking a bow on the opening night of her Broadway play, "After Miss Julie"... Claire Danes spotted exiting the performance.

And in San Francisco: Charlize Theron planting a kiss on a woman during the One X One charity auction - earned for the winning bid of $140,000 which included a two-week trip to South Africa.

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