Katy Perry and Orlando Bloom Hit Red Carpet Separately at Star-Studded Gala, See Their Sexy Styles

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Katy Perry and Orlando Bloom
made their red carpet debut ...sort of.

The 31-year-old pop star and 39-year-old actor have been spotted cozying up to one another on several vacations, but on Wednesday night, they chose to pose separately at the launch of the Parker Institute for Cancer Immunotherapy.

WATCH: Katy Perry and Orlando Bloom Kiss in PDA-Heavy Pic From Romantic Beachside Date

Had they stepped out together, it might have been too much sexy for the cameras to handle, because both stars were smoldering on the red carpet. Perry wore a cleavage-baring strapless leather style that featured sheer lace running down each side of the gown. Meanwhile, Bloom turned heads in his dapper black tuxedo.

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Perry was careful not have cameras catch her with Bloom, but she did pose with a few other celebrities. The "Roar" singer and Girls star Allison Williams, who was celebrating her 28th birthday, hit the carpet together, and Perry was later seen talking to Hart of Dixie actress, Jamie King, inside the event. She also posed for a pic with Lenny Kravitz.

EXCLUSIVE: Jason Bateman Says Pals Katy Perry and Orlando Bloom Are 'Fun' Together

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"Celebrating 28 and the formation of the (Sean) Parker Foundation with the most thoughtful birthday enthusiast," Williams captioned a selfie with Perry. "She brought party props to a gala so it would still feel like my birthday. Love you forever @katyperry."

The actress was later spotted chatting with Bloom inside the gala, and the handsome actor also posed with Katie Couric. Other stars at the event included Lady Gaga, John Legend and Bradley Cooper.

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WATCH: Katy Perry and Orlando Bloom Enjoy Romantic Disneyland Date

Bloom and Perry first sparked romance rumors when they were seen chatting at a Golden Globes after party in January. They've since been spotted out and about all over the world. In February, the two jetted off to Hawaii for a PDA-filled vacation. Check out the intimate pics that include a shirtless Bloom!

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