Only one man in the world can make Taylor Swift act like this, and he was one of many surprise celebrity guests at her final LA concert last night

Taylor Swift ended her sold-out, five-night run of the L.A. leg of her 1989 World Tour show last night at the Staples Center.

After bringing out various surprise celebrity guests throughout her sold-out tour - including EllenDeGeneres, Mary J.Blige, Alanis Morissette, and Chris Rock this week alone - Swift really saved the best for last.

First, Swift pal Selena Gomez came out Wednesday night in a coordinating outfit. The young Swifties went nuts as the two performed a duet to Gomez's new hit single, "Good For You":

 Then, Lisa Kudrow came on stage with a guitar as her "Phoebe" character from "Friends."

Swift asked Kudrow, "What song are you going to sing, Phoebe?" and the two then went into a rendition of her famous "Friends" song, "Smelly Cat."

Next up, Justin Timberlake.

"This has been so hard to keep a secret. You have no idea," Swift told the crowd. "He's been a great friend to me, and will be remembered as one of the greatest musicians of our generation. Justin hasn't performed since he became a dad, so I'm just honored that this is his first performance. Anyone who knows me knows that this is my favorite artist. I am obsessed with his music. It is the one thing that everyone in the world has in common."

And with that, the two performed his hit single, "Mirrors":

To prove Swift's obsession with JT, let's take a look back at her reaction to him serenading her at the iHeartRadio Music Awards in March.

A slew of celebrities were in the audience to catch Swift's record-breaking five sold out L.A. shows.

Kate Hudson brought her sons: "TSwift with my boys ???? ? @taylorswift #SuchFun #LovesOfMyLife"

Nina Dobrev, Lauren Paul, and Zelda Williams used it as an excuse to paint their faces: "Girls Glitter Night ! @LaurenPaul8 @zeldaWilliams #girlsglitternight #TaylorSwiftWednesdays"

 Dobrev had previously been with pal Maria Menounos.

 And "Orange Is The New Black" star Ruby Rose even got a photo-op.

Swift's previous tour stops have been just as star-studded: