Pink Adorably Throws Daughter Willow a 'Big Sister Party' to Celebrate Son's New Arrival

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Pink is making sure Willow loves being a big sister.

The 37-year-old singer took to Instagram to give fans a peek at her fun-filled Saturday, which included a "big sister party" for her 5-year-old daughter.

RELATED: Pink's Daughter Willow Meets Her New Baby Brother Jameson

"Congrats Big Sis! #bigsisterparty," Pink captioned an adorable pic of herself holding her newborn son Jameson Moon, while Willow smiled in front of a cake made just for her.

The "Raise Your Glass" singer has had a lot to celebrate recently. Last week marked Pink and husband Carey Hart's 11th wedding anniversary, and son Jameson was born the day after Christmas.

WATCH: Pregnant Pink Shares 'Super Cute' Sunset Pic of Husband and Daughter

See more on the adorable family of four in the video below.