After performing a sold-out show on her 1989 World Tour in Philadelphia on Saturday, where the real life Olivia Benson [Mariska Hargitay] made an appearance, Taylor hopped on the red eye to California to throw her BFF a star-studded baby shower.
The singer invited a host of famous friends to West Hollywood's Soho House to partake in the festivities -- and they wore crazy costumes, top hats and lots of boas. Being that it was a T. Swift party, there was, of course, a photo booth to document all the fun.
Her "Bad Blood" co-stars Gigi Hadid and Hailee Steinfeld were in attendance, and were joined by Haim, Jessica Alba, Nina Dobrev, Selma Blair and Emma Roberts.
"How can I put this into words... @taylorswift is not only going to be an exquisite Godmother but one of the best friends one could ask for," Jamie, who is expecting her second child with husband Kyle Newman, captioned one of the many pics she posted from her shower. "Thank you Tay for throwing me such an insanely beautiful baby shower. Less then 12 hours after performing for 100k strong. I love you SO MUCH."