Justin Timberlake, Selena Gomez Join Taylor Swift Onstage for Final L.A. Show: Watch

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Taylor Swift and Selena Gomez perform during Taylor Swift The 1989 World Tour Live In Los Angeles at Staples Center on August 26, 2015 in Los Angeles, California. 

On her own, Taylor Swift is trouble. With Justin Timberlake, double trouble. So what about Swift, Timberlake and Selena Gomez

Fans lucky enough to have a ticket for Swift’s fifth and final show at L.A.’s Staples Center overnight witnessed a pop-collab overload, with Timberlake and Gomez taking guest turns on the mic.

Taylor and Justin joined forces for a performance of the former *NSYC star’s 2013 hit "Mirrors" that will be long remembered by everyone in the house. Including Timberlake. “So Justin hasn’t performed since he became a dad, so I’m just honored that this is his first performance,” Swift told the audience, according to Vanity Fair.

The U.S. leg of Taylor’s 1989 World Tour hasn’t just been about the hits. The blockbuster trek has been framed with a theme of friendship, and a seemingly endless lineup of the celebrity friends have joined her onstage. Selena Gomez and fellow #Squad member had her turn at the sold-out Staples Center, where she teamed with Taylor for a performance of her recent hit “Good For You.”

Taylor Swift's 1989 Tour: See All of Her Special Guests!

Swift shattered the venue record on Saturday when she performed her 16th sold out show at the arena.