The filming of the Emmy-winning series, which is ending after seven seasons, wrapped shooting on December 19.
"Last night there was a delay and as happens every time in seven years it ended up with Tracy singing songs from Thriller," she told Zap2it.com.
"It was the same three Michael Jackson songs so many times. Last night, it turned into an impromptu break dance party."
Tina - who stars in and created the comedy - admitted she didn't breakdance or moonwalk, joking instead: "I did take my turn on the dance floor. I was more poppin' and lockin'."
The cast and crew marked the end of the series by taking a group photo, which actor Kevin Brown tweeted with the caption: "The Last 30rock picture Ever."
Alec Baldwin, who plays TV network executive Jack Donaghy on the hit US series, tweeted a picture of him holding a bouquet of flowers in the 'office' on December 14.
"Last day at the office for Jack..." read the accompanying caption.
The series finale of 30 Rock is set to air on US screens on January 31.