Rita Ora and 'SI' Model Irina Shayk Nearly Flash Their Lady Bits at the Vanity Fair Oscars Party

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How much skin is too much skin?

Rita Ora and model Irina Shayk definitely had no problems flirting with that line at Vanity Fair's annual Oscars after party on Sunday night, where they both turned plenty of heads in very revealing dresses.

They also noticeably ditched their underwear.

PHOTOS: Stars In Their Underwear

After Rita took to the stage to sing her Oscar-nominated song "Grateful" from the movie Beyond the Lights, she slipped into this super-sheer Donna Karan dress that showed off a whole lot of booty. Check out the 24-year-old singer confidently strutting her stuff on the red carpet.

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But the 29-year-old Sports Illustrated swimsuit model -- and soccer stud Cristiano Ronaldo's ex-girlfriend -- actually had her beat in this Atelier Versace design, which basically showed off her half-naked body.

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Not to be outdone, Lady Gaga also got in on the sheer trend at the star-studded festivities, but the 28-year-old singer opted to go bra-less rather than ditching her undies.

Are you feeling gothic Gaga?

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PHOTOS: The 9 Best-Dressed Stars at the Oscars

Relive Gaga's amazing 50th anniversary Oscars tribute to The Sound of Music in the video below.

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