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Nick Jonas, Taylor Swift

Twitter, Getty Images

Taylor Swift, your surprises are just becoming too much to handle!

Saturday night was another sold-out concert as the singer continued her 1989 World Tour. And as fans danced the night away at Met Life stadium, the "Shake It Off" crooner had quite a few tricks up her sleeves for loyal Swifties.

In between performing her biggest hits, Swift brought former Jonas Brothers member Nick Jonas out onstage to deliver an impromptu rendition of "Jealous."

"Unreal feeling jumping on stage with my friend @TaylorSwift13 tonight at the #1989TourEastRutherford show in my hometown," Jonas wrote on Twitter. "Thank you so much @TaylorSwift13 for having me. What an incredible memory…"

Speaking of memories, we decided to dig through the archives where we uncovered a classic photo of Swift performing with Jonas more than six years ago.

Sure the muscles and abs have grown on Jonas. And yes, Swift's hair may be a whole lot shorter and less curly. But the two musicians have managed to stay close friends and supportive of each other's careers.

"Last night, the incredible @NickJonas sang ‘Jealous' and 60,000 people sang it with us/screamed uncontrollably," Swift wrote on Twitter. Yep, we would have been one of the screamers.

Luckily, the surprises didn't stop there! As soon as the sounds of "Style" were overheard in the packed house, Swift welcomed Martha Hunt, Candice Swanepoel, Lily Aldridge, Uzo Aduba, Karlie Kloss, Behati Prinsloo and Gigi Hadid to the stage where they strutted their stuff. 

Taylor Swift

Getty Images

And if you're wondering who impressed the audience in a big way, the answer may surprise you.

"When @UzoAduba walked out, it provoked one of the loudest screams from the crowd I've EVER heard," Swift tweeted. "I just love herrr."

Aduba added, "I love youuuu! That was so much fun! What an awesome Saturday night. I like your Style ;-)."

Fifth Harmony member Camila Cabello, Joe Jonas, Nat Wolff, Heidi Klum, Lena Dunham, Hailee Steinfeld, Katie Holmes and others were also spotted watching one of the singer's shows over the weekend.