Kelly Osbourne and her boyfriend Matthew Mosshart have become engaged while on holiday in Anguilla.
The couple met at the 2011 wedding of Kate Moss and Jamie Hince, who is part of musical duo The Kills with Mosshart's sister Alison.
"I've never felt this close to another human being, ever," Osbourne told Hello! magazine.
"People say we're co-dependent but we just want to be together all the time."
Mosshart, who popped the question, moved from New York to Los Angeles so the pair could be together more often.
"I knew she was 'The One' pretty early on," he said.
The daughter of celebrity couple Ozzy and Sharon Osbourne said her fiance made the "biggest sacrifice" by moving to LA to be with her.
"Long-distance relationships often don't work out. We'd dated for a year and knew we wanted to be together," she said.
"Matthew has broken down every one of my walls.
"There's nothing I wouldn't do in front of him."
Osbourne said her ring is intended to look like one of her father's earrings.
"I used to hold my finger up to his ear when I was little and say: 'I want a ring like that'. Now I have one," she said.
Osbourne also said the recent separation of her parents was only temporary.
"As if my mother would ever leave my father! They were never getting divorced, they were separated," she said.
"As Mum said, 'you're drinking again and I'm not going to talk to you,' like any normal person would do.
"Then Dad got himself together. He's been under a lot of pressure - the new Black Sabbath album, my brother's MS ... Things can get too much for addicts to handle."