Jessica Biel, Sean 'Diddy' Combs and Ashley Tisdale: Hottest Star Sightings of the Day (PHOTOS)
The star power was out in full force this weekend, with celebs at major American Music Award afterparties and movie premieres all across the globe.
Cassie was also at the party, held at VIP Room, and danced with both Rihanna and Diddy for most of the evening.
Jessica Biel was at the New York premiere for her upcoming flick Hitchcock in a gorgeous grey ensemble.
On the other side of the coast, Ashley Tisdale stunned on the red carpet for the 2012 Rolling Stone AMA After Party presented by Nokia and Rdio held at Rolling Stone Restaurant & Lounge in West Hollywood on Sunday. The actress' bold red dress showcased her killer physique.above for a complete look at the latest celebrity sightings.