Is Kelly Osbourne secretly engaged to her boyriend of over a year, Matthew Mosshart? Well, that's the word on the street.

The couple reportedly had an under-the-radar engagement a few weeks before Christmas (yes, that long ago), and according to pals close to the Fashion Police cohost, Kelly could not be happier!

"Kelly is the happiest she's ever been," a source tells Us Weekly. "Her career is going well and she's in a healthy relationship with a wonderful guy."

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Kelly hasn't exactly been "lucky in love," as she's been through several failed relationships, a called-off engagement and even had a wedding which turned out to be non-binding. This time around, though, Kelly can't stop gushing about her beau, who she met at Kate Moss' wedding in July 2011. They first stepped out as a couple later that year.

The mag's source also reveals that Kelly and Matt are already planning their wedding, which is set for this summer in England. Congrats!

Do you think Kelly and Matt will last?

Photos Courtesy of: Fame/Flynet & Getty IMages