The 'California Gurls' singer - who got engaged to the reformed hellraiser in December after a whirlwind romance - constantly 'told' the British comic star she wanted him to pop the question by using the power of her mind.
She explained: "I was trying to make him tell me that he wanted to marry me telepathically. Every night we looked into each other's eyes and I was thinking, 'Please ask me, please ask me.'
"Then, when we finally talked about the idea of getting married, he admitted he was thinking the same - he'd been trying to tell me that I was the woman he wanted to marry by communicating it with his eyes.
"So all the time we'd been sending each other subliminal messages!"
The 25-year-old pop star - who previously dated Gym Class Heroes lead vocalist Travis McCoy - also revealed she and Russell like to make up stories about their impending nuptials so their true wedding plans remain secret.
She told Britain's Star magazine: "Russell makes up these really crazy stories about me and our wedding. I make up stories, too - I said he was a 'groomzilla'. He said I farted a lot, but I've never farted in front of him - honestly!
"I hear these crazy stories - we are going to get married in latex, underwear, in Spandex, in Japan, in India, in Thailand. But I think all this craziness about my marriage is really funny.
"And I don't set the record straight as I love this chaotic circus of wrong information, because it is not really anyone else's business beside the people that we have invited and us, of course."