The "A Wrinkle in Time" actresses enjoyed the theme park with co-star Storm Reid after attending a surprise screening of the film at Sunset Showcase Theater in Disney California Adventure Park.
Kaling, Winfrey and Witherspoon play Mrs. Who, Mrs. Which and Mrs. Whatsit in A Wrinkle in Time, which is based on the Madeleine L'Engle book of the same name. Reid stars as young protagonist Meg Murray.
"#WrinkleinTime's Mrs's and Meg surprised fans @disneyland," Disney Studios captioned a slideshow on its official Instagram account.
Kaling shared a series of posts on her own account, including a Boomerang video of herself and Witherspoon wearing black and silver Minnie Mouse ears.
"@reesewitherspoon! Boomerang by my love @mollyrstern," she wrote, tagging makeup artist Molly R. Stern.
The Disneyland trip marked Kaling's first public outing since welcoming her first child, daughter Katherine, in December.
The new mom shared a makeup-free selfie during a girls weekend with a friend this month.
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"No makeup no filter mom night out with @juliaspowellart," she wrote.
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