Kelly Osbourne is secretly engaged. The Fashion Police star's boyfriend Matthew Mosshart popped the question a few weeks before Christmas and now the couple - who have been dating for around 18 months - are "really excited" about planning their nuptials.

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

The wedding is set to take place in Kelly's native UK this summer.

Kelly and Matthew met at the nuptials of Kate Moss and Jamie Hince in July 2011 but didn't go public with their romance until five months later. Kelly recently spoke about her love for Matthew and said he made her realize what real love is: "I couldn't believe that he truly liked me because I never think people ever could. But I'm so happy. I don't think I've ever really known what love is like before."

And it's not just Kelly who's impressed with the vegan baker - he's a big hit with her parents, Ozzy and Sharon. "Kelly's family love her boyfriend. They think he's the nicest guy she's ever dated. He is very patient and down to earth," a source said.