Jan Ravnik , who went viral as Taylor Swift 's gorgeous "Eras" tour backup dancer, is ready to "shake, shake, shake, shake" it in the ballroom ... he's joined Season 34 of "Dancing With the Stars."

The ABC dancing competition broke the casting news Thursday, after previously teasing a Swift-centric update the day before. Disney

ICYMI ... the 'DWTS' social accounts pushed out a photo of purple glitter, similar to the aesthetic shared by T Swift amid her new 'Life of a Showgirl' era.

Many wondered if the Taylor tease was possibly the announcement of a Swift-themed night on 'DWTS' ... but others pondered whether a big casting announcement was coming, as the show has yet to announce the full lineup.

That was it ... Jan is joining the show as one of the new pros. His celebrity partn

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