Rihanna, Cee Lo Green and Kate Moss: Hottest Star Sightings of the Day (PHOTOS)

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Photos from the set of Rihanna's new music video.
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Rihanna had a very good Halloween, thanks to a new honor bestowed on the “Diamonds” singer.

On Wednesday night, the 24-year-old superstar was crowned West Hollywood’s Queen of the Carnival at the Greystone Manor Supperclub. The bash was attended by a slew of famous friends including Rihanna’s ex Chris Brown, who donned a head-turning costume.

In other Halloween celebrations, Cee Lo Green was spotted hanging out with a couple of superheroes on Hollywood Boulevard. While The Voice mentor did not put on a costume, it looks like he had a few meaningful conversations with Spiderman as the Green Lantern looked on.

Continuing the Halloween spirit, Gwen Stefani was spotted with her No Doubt bandmates in London. Rocking a pair of leather pants and a pink jacket, the singer had some Halloween fun with fake blood makeup on her neck and head.

Elsewhere in London, Kate Moss looked chic in a leopard print jacket and yellow clutch while running errands on Thursday.

For more of the day’s hottest celebrity sightings, check out Celeb Snaps, above.

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