Katy Perry and her big sister Angela Hudson spent their Thursday together for a good cause.

The sisters joined Nicole Richie and Zooey Deschanel at the Baby2Baby event in California, even posing together for a few photos together.

Baby2Baby is a nonprofit organization that provides diapers, clothes and other necessities for children in poverty in the Los Angeles area and in other disaster areas across the United States.

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Nicole Richie, Zooey Deschanel and Katy Perry. Photo: Getty Images for Baby2Baby
Nicole Richie, Zooey Deschanel and Katy Perry. Photo: Getty Images for Baby2Baby

Katy wore an adorable pink jumpsuit and tucked her platinum blonde hair under a crocheted hat while Angela rocked denim, a grey t-shirt and Adidas sneakers.

“So honoured to join the coolest club of being an Angel for @baby2baby!” the “Roar” singer captioned a series of photos shared to Instagram. “Becoming a mother made me aware of the many everyday needs of our beautiful 👶🏼blessings👶🏼 and how sometimes those needs are hard to meet for some families. Thankfully that’s where @baby2baby steps in!”

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She continued, “Yesterday I got to participate in their back2school event with my sister Angela and we help kids get ready for the year ahead with all the gear!!! Loves it! ♥️”

Katy welcomed her first child last summer, a baby girl named Daisy, with fiancé Orlando Bloom.