Star Reveals Secret Engagement: Once A Stroppy Teen, Now She’s In Love And Wants Everyone To Know

“I’m in love and I don’t care who knows about it!”, the once-stroppy teenager tweeted last June.

She didn’t mind who knew she was in love, but Kelly Osbourne kept her engagement secret for nearly a month! That’s years in Celebland…

There’s no question about it, the Fashion Police co-host is absolutely gaga over her fiancé, Matthew Mosshart.

The 28-year-old star and her 29-year-old boyfriend-turned-fiance quietly got engaged just a few weeks before Christmas, sources close to the couple confirmed to Us Weekly.

The pair have been dating for just over a year and are reportedly “very excited” about taking the next step in their relationship.

"Kelly is the happiest she's ever been," an Osbourne pal said.

"Her career is going well, and she's in a healthy relationship with a wonderful guy."

Kelly's story made the cover of this week's Us Weekly.

Osbourne and Mosshart first met about a year and a half ago, at her friend Kate Moss’s wedding in July 2011. They first stepped out in public in December 2011, with a few shows of PDA on the streets of New York.

"I couldn't believe that he truly liked me because I never think people ever could," she told UK magazine Fabulous of her boyfriend in an interview last October. "But I'm so happy. I don't think I've ever really known what love is like before."

Vegan baker Mosshart has proved to be a hit with all of the Osbourne clan. Sharon, Ozzy and siblings Jack and Aimee have all given Mosshart their stamp of approval.

"Matthew is a stand-up guy," a source close to the Osbourne clan told Us.

The couple have already starting to plan their nuptials, set to take place this summer in the UK.