Taylor Swift Seeking $1 in The DJ Butt Grabbing Case

Taylor Swift' says she's setting an example for others to say NO.

Taylor was in court Tuesday with her lawyer, who just said in opening statements that she is only seeking $1 in her countersuit against former DJ David Mueller on principle -- because she believes what he did is assault. Swift's lawyer also told the courtroom ... Taylor's absolutely certain Mueller grabbed her butt and is going to declare it on the stand.

Mueller's attorney, however, says David "unequivocally denies" he touched Swift in an inappropriate way, and his career has been ruined by her butt grab allegations. He originally sued her, claiming she defamed him by saying he groped her rear end.

The trial began Tuesday after jury selection concluded with 2 men and 6 women being chosen. Mueller was just called as the first witness before court broke for lunch.