"She had so much fun with Simon, and Russell was chatting with him too," UsMagazine.com quoted a source as saying. "Katy was hugging Russell a lot after her performance. She kept asking him 'Was I OK?' 'Was it OK?', but he was nothing but supportive. He was stroking her bum in her catsuit. He couldn't keep her hands off her, actually," the source added.
But the pre-wedding fun didn't end there. "Her and Russell had their very own private screening of The Social Network," another insider said. "They were driven back to the hotel after," the insider added.
The performance marked Perry's final public appearance as a single woman. According to a source, the couple will fly to India for an over-the-top, 6-day extravaganza. Private jets will bring in most of the 50 to 75 guests -- including Perry's pal Rihanna -- who will bunk in six 'pimped-out' tents.