T.S. hit up Jack Antonoff's rehearsal dinner Friday night, and so many fans found out ahead, they caused a major New Jersey road to be impassable.

Antonoff, Taylor's frequent collaborator, is marrying actress Margret Qualley, and they celebrated at the Black Whale restaurant in Beach Haven.

Cops apparently got the memo Taylor was going to show, so they were out in force to control the hundreds of fans who wanted to catch a glimpse of their hero.

Swift has been performing regular 3 hour shows around the country, but she still has the energy to party well into the night,