The woman, who said she was 24 at the time, said she knew Mr Travis, now 68, was suggesting she pose in a bikini or her underwear after noticing a similar photo of a pop star on his wall.
The witness said the incident took place when she went to the former BBC presenter's home to interview him about a photograph of him and Jimmy Savile alongside a number of other DJs.
She told Southwark Crown Court, London, that while there Travis grabbed hold of her breasts "as if he was judging himself - whether they were big enough. He wanted to me to strip down," she said.
Stephen Vullo, defending Mr Travis, put it to the woman that Mr Travis had said the incident did not happen. She replied: "That's a lie."
Mr Travis, from Buckinghamshire, denies 13 indecent assaults and one sexual assault, dating back to 1976.
The trial continues.