The "Dark Horse" hitmaker celebrated her big day last month and, taking to Instagram on Thursday, October 31, the star shared a gallery of snaps of her and her beau standing among the pyramids against a red sunset, as she reflected on the milestone.
"Ancient Egyptians believed that when you pass on your heart had to be weighed," she wrote in the caption. "It had to be lighter than a feather to be qualified for the trip to the afterlife. My mother has called me feather since I was a little girl and I hope after all is said and done my heart is as light as one. This is 35."
"Carnival Row" star Orlando also shared a series of sweet photos from the trip, marking the birthdays of his bride-to-be and his mum, as he penned: "It's like looking out over the entire cosmos - Egyptian magic got my heart open to a download of love for my Scorpio's wonder women both celebrating their #birthday."
Meanwhile, Katy marked her big day on October 25 with a sizzling swimsuit snap, gushing: "35 and never more alive."