The bash was reportedly held at Apple executive Jimmy Iovine's Malibu home. That location totally makes sense considering she just recently announced plans to release a film of her 1989 tour on Apple Music.
In an Instagram photo posted by Jimmy's son Jamie Iovine, Tay Tay, Cal, and Jamie posed in a silly selfie while the festivities were in full-swing.
"I was just adopted by @calvinharris and @taylorswift mom and dad are gonna show me the good life now," he captioned the shot, poking fun at music's highest-earning couple.
In several pics posted online, the birthday girl posed with Santa and Mrs. Claus. In another clip shared on social media, Taylor was serenaded with "Happy Birthday" by the entire room of guests.
It was an emotional day for her. She shared her personal thoughts about getting another year older.
"Today I begin my 26th year of freaking out over stuff," she captioned a photo of her younger self dressed in a Little Mermaid sweatshirt while carrying a backpack and making a very shocked face for the camera.
Happy belated birthday, T-Swift!
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Gallery | Celebrity Birthday Bashes