File photo: Taylor Swift and her mom Andrea. Picture: IMAGE: CHRIS PIZZELLO/INVISION/AP/ASSOCIATED PRESS

Los Angeles — Taylor Swift's mother broke down in tears as she gave emotional testimony on Wednesday in a Denver, Colorado, courtroom, during a radio host's lawsuit against the pop star.

"I know what happened I heard it from my daughter's mouth," said Andrea Swift, Taylor's mother.

"He sexually assaulted her, that guy," Swift's mother said, looking at Denver radio host David Mueller, according to local broadcaster KMGH The Denver Channel.

Read: Taylor Swift's mom wanted to avoid fallout from alleged groping

She also said she "wanted to vomit and cry" after hearing about the alleged groping, the broadcaster reported.

Mueller's lawsuit alleges that Swift made false accusations - that he groped her during a meet-and-greet in 2013 - that led to him being fired, according to court documents.

Swift counter-sued, accusing Mueller of assault. She alleged that during a staged photo opportunity, Mueller reached underneath her dress and touched her buttocks.