The amfAR gala has returned to Las Vegas - with a whole host of famous faces on the guest list.
In partnership with the Formula 1 Grand Prix, which takes place this weekend, the event includes a seated dinner, extravagant live auction and top-tier entertainment.
A-listers have gathered in their droves to support amfAR's HIV/AIDS research including Jeremy Renner who will be honored with this year's Philanthropic Leadership Award.
Back at its inaugural Las Vegas gala in 2024, organizers raised more than $3 million for AIDS research - with hopes that this year will enjoy similar success.
With swarms of stars descending on the event, there have already been a range of sartorial successes as well as fashion flops.
Ciara, Ayan Broomfield and Chanel Iman are among the big names who have all popped up on the red carpet.
Here, Daily Mail has rounded up the best and worst dressed celebrities in attendance so far tonight.
BEST
- American model and former Victoria's Secret Angel Chanel Iman, 34, showcased her fashion credentials as she slipped into a black faux-leather blazer dress complete with gold buttons which she paired with heeled ankle boots.
- Tech, culture & F1 commentator Toni Cowan-Brow opted for a chic, black gown boasting a plunging sweetheart neckline that tapered in at the waist before slipping into a pair of heels and adding a slick of color with her nail varnish and lipstick.
- Canadian tennis player Ayan Broomfield, 28, wore a high neck, mermaid-hemmed dress with a sheer overlay before elevating the ensembles with a $3,995 bag by Roberto Cavalli.
- Celebrity fashion designer Jeff Hamilton flaunted his fashion prowess in a suave black suit, crisp white shirt and blue patterned cravat.
WORST
- Singer Ciara, 40, (left) and actress Paulina Chávez, 23, (right) risked suffering an embarrassing clash as both oped for daring animal-print dress with black pointed-toe heels.
- Singer Channing Wilson did not appear to dress up for the occasion - instead deciding on blue jeans, checkered shirt, leather waist coast and a pair of cowboy boots. He finished the look with a pair of red-tinted sunglasses.
- Actress Jo Champa, 57, appeared to flash some serious flesh in a $3,400 long silk-blend dress by Roberto Cavalli which she paired with a $2,240 bag from the same designer and a tiger print coat that she wore draped down her shoulder.
- Rising star singer Cassidy Daniels's sparkling all-black ensemble that boasted long sleeves and a thigh-high split proved to be a little lackluster as she posed for photographers on the red carpet.