01/23/2013 08:34 pm ET

Secret Celebrity Engagements: Kelly Osbourne And 9 Other Stars Who Kept Mum (PHOTOS)

While celebrities often announce their engagements within hours of deciding to tie the knot, some choose to keep their marriage plans a little quieter.

"Fashion Police" star Kelly Osbourne has been secretly engaged to boyfriend Matthew Mosshart for more than a month, Us Weekly reported Wednesday. Osbourne joins other low-key celebrities who chose to keep their engagements a secret, preferring to confirm the news long after deciding to get hitched.

Check out the slideshow below to learn which celebrity couples kept us clueless about their engagements.

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