Sharon took to Twitter last night (16 July) to share her joy for the loved-up couple, explaining that vegan chef Matthew was "worth waiting for".
This week, Fashion Police co-host Kelly confirmed her engagement to her boyfriend of two years after he proposed to her while they were on holiday on Caribbean island Anguilla.
Proud mum Sharon, who recently celebrated a milestone 31 years of marriage with rocker husband Ozzy, publicly sent her congratulations, saying: "@OfficialOzzy & I are so happy @KellyOsbourne found her partner in life.
"He was worth waiting for. Here's to many years of love & happiness."
Kelly and Matthew met in 2011 at supermodel Kate Moss' wedding to Jamie Hince. Kelly was previously engaged to British model Luke Worrall in 2009 but they split a year later.
Check out some other engaged stars in our gallery below!
Copyright: Instagram Mark Wright