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Baby fever is at an all-time high in the Osbourne family … as Kelly Osbourne showed off her baby bump while attending a baby shower for another family member.

Kelly was all smiles as celebrated her brother Jack and his fiancée, Aree Gearhart, at their baby shower — held at Ozzy and Sharon‘s house. Jack and Aree are expecting their first child together.

Of course, Kelly was on auntie AND soon-to-be-mommy duty … she rocked a light pink dress and violet hair, but her growing baby bump stole the show. As we’ve reported, Kelly announced she was pregnant for the first time earlier this month.

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She wrote on Instagram, “I know that I have been very quiet these past few months so I thought I would share with you all as to why… I am over the moon to announce that I am going to be a Mumma…”

While she didn’t say who she was having a baby with, she recently told her followers she was dating Sid Wilson from “Slipknot” when she wrote, “after 23 years of friendship I can’t believe where we have ended up! You are my best friend, my soulmate and I am so deeply in love with you Sidney George Wilson.”

Congrats auntie and mommy-to-be!