caught the moment when the I Kissed a Girl hitmaker called out for , 44.
With her hair combed into a bow, the music star wore a stunning dress, which had "a girdle" underneath.
The Lord of the Rings star had to pull the zipper "all the way down."
The crowd cheered as Orlando finally unzipped her back.
Katy announced on the mic: "Now I can breathe!"
He rushed back to his seat while the pop star said: "My hero."
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The movie star also shared snapshots from the prestigious event
He captioned the post: "It was a privilege to celebrate the power of women last night.
"I’m so proud of you and your huge heart that champions everyone around you."
He concluded: "The Firework Foundation is the essence of your beautiful and childlike spirit."
Katy and Orlando are the parents of their 1-year-old daughter, Daisy Dove.
Orlando also shares 10-year-old son with ex-wife .
THE YACHT RIDE
Back in August, the engaged couple had gotten hot and heavy
Katy rocked a brown swimsuit as she grabbed Orlando's butt.
The two had quite the steamy kiss on a yacht in Capri.
Katy turned heads in her swimsuit which featured thick straps and a square neckline.
The pair continued to hug and kiss while on the yacht.
He wrapped his arm around her waist and brought her closer to him.
SWIMMING WITH SHARKS
Then in September, the 44-year-old did not seem to realize there was a huge "" circling in the water below him.
Orlando and his friend were paddleboarding off the coast of Malibu when they spotted a shark following them and swimming between their boards.
Photographer Carlos Gauna caught Orlando's shark experience in a minute-long video.
Orlando posted the awe-inspiring clip on social media and wrote: "Paddle Boarding With Great Whites."
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Carlos captioned his post: "Awesome day man. You got some good looks of a large juvenile white shark. Happy for you!
"Something you'll never forget. Very calm shark just chilling in Malibu!"
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