My oh my, what a long way they've come. There's no denying that Taylor Swift and Nick Jonas have grown up from their Disney days, but in an early Throwback Thursday post, we really get to see how our childhood favorites have grown up. After Jonas joined Swift at her 1989 World Tour stop in East Rutherford, New Jersey, over the weekend, the "Bad Blood" singer got all nostalgic on her Twitter - and we're right there with her.

Swift shared a side-by-side of two pictures from 2009 and 2015 where we can see just how far the two have come.

On the right, baby Jonas and Swift can be seen rocking out at a Jonas Brothers concert back in the day. The two are notably younger, with awkward curly mops of hair on their head and no one can deny that dorky lip underbite Jonas is rocking. On the left, however, we see two bona fide, confident pop stars. There's less hair but more confidence as the two performed Jonas' hit "Jealous" in New Jersey.

And it has Swift feeling "all the feelings."

Jonas couldn't believe the transformation either, remarking how fast the time has gone since those two youngins took the stage.

Swift and Jonas seemed to have a ball at New Jersey's MetLife Stadium on Saturday (July 11). After the sold-out concert, Swift jumped onto her Instagram to remark how everyone sang along and screamed as the two took the stage.

 Last night the incredible @nickjonas sang 'Jealous' and 60,000 people sang it with us/screamed uncontrollably.

A photo posted by Taylor Swift (@taylorswift) on Jul 12, 2015 at 8:10am PDT

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