Paparazzi photos from Saturday, September 18 and Sunday, September 19

Rachel Bilson picking up her dog from Tailwashers in L.A. (pics start here)

Dulce María performing at People En Espanol's celebration of "Hispanic Heritage Month" in L.A. (pics start here)

Karina Smirnoff leaving a dance studio in L.A. (pics start here)

Jessica Alba and husband Cash Warren at a friend's wedding at Greystone Mansion in Beverly Hills (pics start here)

Rihanna and Katy Perry celebrating her bachelorette party at Club XS at Encore in Las Vegas (pics start here)

Khloe Kardashian leaving Velvet Nails in Encino (pics start here)

Chris Noth arriving at LAX airport (pics start here)

Kate Hudson and Kurt Russell riding bikes in Santa Monica (pics start here)

Lacey Schwimmer leaving a dance studio in L.A. (pics start here)

Heidi Klum shopping at Planet Blue in Beverly Hills (pics start here)

Seth Rogen walking his dog in West Hollywood (pics start here)

Reese Witherspoon shopping in West Hollywood (pics start here)

*121 paparazzi pictures total in the gallery:

[Flynet, WENN, Pacific Coast News, Mavrixonline]