This past weekend  was filled with celebrity sightings all over, especially in L.A.

Rihanna and Rob Kardashian were spotted racing go-carts, and though many thought they were on a date, they were actually joined by a few other friends.  The group then headed over to Greystone Manor Nightclub in Hollywood where they partied with fellow celebrities Chris Brown, Christina Milian, Andrew Knight (Suge Knight’s son), and Lauren London, who did a good job of dodging the paparazzi.

Before the weekend really started, we spotted Rihanna dining at Il Ristorante di Giorgio Baldi in Santa Monica for the second time that week, Ciara arrived at LAX, and NeNe Leakes was out and about in Beverly Hills.

NFLer Michael Irvin was seen posing for photos with fans before jumping into a cab in New York City, while DJ Connor Cruise was seen leaving from the Chinawhite nightclub in London where his father, Tom Cruise was also seen in attendance. “X Factor’s” Misha B and former Sugababe singer Keisha Buchanan were seen leaving the Rose Club in London, and Alexandra Burke was spotted leaving the Novikov restaurant in London the same night.

Take a look at Rihanna, Chris Brown, Ciara, and more celebrities out and about.