Kim Kardashian, Vince Vaughn and Rihanna: Hottest Star Sightings of the Day (PHOTOS)
Now that the holiday weekend is over, celebs around the globe are getting back to their daily routines. From filming blockbuster flicks to performing live on television, Hollywood's biggest stars are keeping busy.
Rihanna was spotted in London after filming her live performance on The X Factor UK. The singer appeared unfazed as she performed "Diamonds" while getting soaked by raindrops on stage.
Across the pond, Vince Vaughn was on the set of The Delivery Man in New York City's Central Park.
The actor spent most of his scenes around the Bethesda Fountain and snapped shots of his co-stars and crew members during his off time.