Kelly Osbourne buys her mom a diamond ring

Kelly Osbourne bought her mother a diamond ring for her birthday. The 25-year-old star enjoyed a low-key celebration with Sharon Osbourne — who turned 58 earlier this month — and surprised her famous parent with the sparkling band and a sweet treat.

“I couldn’t figure out what to get my mum because she’s one of those people who will just end up buying something for herself if she really wants it,” Kelly wrote in column for Britain’s Closer magazine.

“I ended up getting her the most beautiful ring with a moonstone and diamonds.

“I also surprised her with a cake from a Los Angeles bakery called Sweet Lady Jane’s. They make this amazing berry cake that people here are obsessed with — it’s decorated with flowers and vines made out of icing. We spent the night in, just the two of us — it was low-key in the best of ways.”

Kelly and Sharon — who is married to rocker Ozzy Osbourne — are so close they even exercise together.