Kelly Osbourne Shows Off Son Sidney's First Tooth After Celebrating Second Thanksgiving as a Mom

Osbourne, 39, celebrated her son's first birthday earlier this month

Kelly Osbourne is celebrating a special milestone with her son!

The 39-year-old shared a sweet photo of 12-month-old Sidney sprouting his first tooth on Friday after celebrating her second Thanksgiving as a mom.

"We got a tooth 🦷," Kelly excitedly wrote in the caption.

In the snap, the former reality star smiled as she held Sidney — whom she shares with Slipknot rocker Sid Wilson — as he showed off his new tooth during a walk in the sunshine.

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Grandmother Sharon Osbourne was just as excited by the milestone, as she reposted Kelly's photo of Sidney on her Instagram Story.

Kelly's latest post comes after the first-time mom celebrated her son's first birthday with a spooky-themed party earlier this month.

"This past year has been the most magical year of my life for one reason. That reason is you, baby Sidney. To watch you grow, learn and become a little man is the greatest joy I have ever felt," Kelly captioned her reflective post at the time.

Related: Kelly Osbourne Throws Spooky Bash for Son Sidney's First Birthday: 'Greatest Joy I Have Ever Felt'

"The most magical bond I have ever experienced is the bond I feel with you. Before you, love was just a word that I thought I understood. NOW I truly understand what love is," she continued. "I am forever indebted to you for teaching me the beauty, meaning and truth of love. What more can I say other than I love you."

"Happy birthday sweet [prince]. We made it on our first trip around the sun together."

The former Fashion Police host also shared scenes from Sidney's birthday party, a celebration shared with friends and family. Adorable ghosts decorated the black-and-white tiered cake as kids played in a padded outdoor area with different drums and toys for all kinds of fun.

Related: Kelly Osbourne Cuddles Up with Son Sidney in Sweet Photo as She Gets Glammed Up for the Day

Speaking on the first episode of the second season of The Osbournes podcast back in September, Kelly celebrated her little boy's budding personality.

"He's gonna be such a naughty little boy," Osbourne squealed, delighted. "He's funny. It's weird to me how I look at him and he's like 18 weeks old and he does things that are just really funny."

She was also happy to share that Sid "loves his nana" Sharon, 70. "He goes and sees nana every morning and every night before bed and he just sits there laughing and chuckling."

"I do silly voices for him and he just loves it," Sharon explained. "He's very smiley with me."

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