Christina Aguilera flaunts ultra tiny waist in scantily-clad outfit while Kesha flashes derriere in see-through dress at starry West Hollywood party

Christina Aguilera and Kesha turned up the glamour as they led the stars at the second annual party on National PrEP Day.

On Saturday night, the two pop superstars showed off their sex appeal as they dressed up in daring, sheer looks for the special occasion. 

The pop divas made show-stopping arrivals in West Hollywood for the event held by LGBTQ+ telehealth platform MISTR to raise awareness of pre-exposure prophylaxis (PrEP), reduce stigma surrounding HIV and expand healthcare access. 

Aguilera, who revived her hit song Lady Marmalade on its 25th anniversary for a recent beauty ad, flaunted her tiny waistline in a racy, black outfit with dramatic, over-the-knee boots.

She wore a see-through, cross-covered top layered over a lacy bra and leather micro shorts. 

On the red carpet, Kesha, 39, showed off her pert derriere and posed for a cheeky snapshot with fellow singer Tove Lo, as the duo placed their hands on each other's hips.

The TiK ToK hitmaker put on a bold display in a skintight, sheer dress in an animal-print pattern. 

She went braless underneath the long dress with sleeves connected to gloves.

Like Aguilera, she styled her hair in messy beach waves and rocked a sultry, smoldering makeup look.

Aguilera attended the party after she stirred up fan discourse about her appearance at the opening of the Obama Presidential Center in Chicago in June. 

Aguilera's blonde locks were styled in their signature waves as she took to the stage, but some social media users immediately noted that her face may have been altered with the help of heavy makeup or some surgical tweaks. 

Fans of the pop star said she looked like an 'imposter' in response to her performance at the star-studded event. 

For the event, Tove Lo wore a T-shirt halter dress with daring cutouts that showed off her curves.

Other stars at the event include Chappell Roan, Demi Lovato and Kim Petras. 

The party was also attended by social media mogul Bella Poarch, model Emily Ratajkowski and many Bravo franchise stars. 

For the party, Roan showed off her fit physique in what appeared to be a Shark Tale-inspired look featuring a red, striped latex dress with opera gloves and over-the-knee socks. 

She wore sky-high stilettos and styled her fiery red hair with bright, blonde stripes to match her dress. 

Lovato rocked a deep purple, corset-style dress with a red lace bra layered over the bust and completed her look with pointed-toe pumps and a sleek blowout. 

Petras rocked a chic fur coat paired with semi-sheer stockings, knee-high boots and a vintage, leather handbag. 

Emily Ratajkowski wore a plunging halter dress layered over fitted trousers and sandal heels. 

Bella Poarch wore a plaid dress with a waterfall-style skirt paired with a leather motorcycle jacket and knee-high boots. 

Bravolebrities were also out in full storm as Housewives Meredith Marks, Phaedra Parks and Sutton Stracke wore glamorous looks and attended the soiree together. 

Last year, MISTR thrwe the first-ever National PrEP Day party in West Hollywood, and Demi Lovato and Cardi B were among the stars who kicked off the inaugural event.

The telehealth organization seeks to spread awareness and stop the stigma regarding HIV. 

Since 1996, an anti-retroviral therapy (ART) has been available to suppress the virus, saving the lives of those with HIV and protecting others from the virus.

Drugs were also invented to lower an HIV-negative person's risk of contracting the virus by 99 percent. 

In recent years, research has shown that ART can suppress HIV to such an extent that it makes the virus untransmittable to sexual partners.