Kelly Osbourne celebrates Valentine's Day with a kiss from her “soulmate” Sid Wilson

Kelly Osbourne/Instagram Kelly Osbourne and Sid Wilson

Kelly Osbourne sends her Valentine some lovely greetings.

In honor of Valentine's Day on Monday, the Fashion Police The 37-year-old alumna shared a carousel of sweet photos dedicated to her Slipknot rocker boyfriend on social media.

“After 23 years of friendship, I can't believe where we've ended up!” the reality star wrote alongside a photo of her and Wilson smooching. “You are my best friend, my soulmate and I am so in love with you Sidney George Wilson. 💜”

In the post, she also shared a photo of Wilson giving her a kiss on the cheek, one in what looks like a spaceship, one of him smiling with a dog, and a serious selfie showing off her overalls.

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Shortly after her post, 45-year-old Wilson commented with several red heart emojis.

He then shared the photo on his Instagram feed and wrote, “There are not enough colors to express the palette of love I feel in my heart for you 💜 Happy Valentine's Day my love XoXo.”

Earlier this month, the couple attended a family reunion together in Los Angeles.

They were photographed attending a fourth birthday party for Osbourne's niece Minnie, the daughter of her brother Jack.

At the time, Osbourne shared a photo on her Instagram story of herself and Wilson cuddling up to Wesley, her parents' dog.

“Wesley is not only daddy’s favorite, he’s Sid’s favorite too!” she wrote.

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Although Osbourne and Wilson have known each other since 1999, when they met on Slipknot's tour of Ozzfest, the music festival founded by Ozzy and Sharon Osbourne, their relationship has recently turned romantic, a source told PEOPLE last month.

“They have remained friends since [first meeting]said the source. “They are very happy together.”

In late January, Osbourne revealed how she stays close to her boyfriend even when they are apart, showing off a large pillow belonging to Wilson that she took with her on a trip to Ireland and Italy.

“Wherever I go, I take my baby with me 😂,” she wrote under a slide in her story, in which she poses with a large, screen-printed pillow with the musician's face.