According to the report, Ratajkowski initially enjoyed the video shoot - but then Thicke, who was apparently intoxicated, began to "behave badly".
"He smiled a goofy grin and stumbled backward, his eyes concealed behind his sunglasses. My head turned to the darkness beyond the set. (Director Diane Martel's) voice cracked as she yelled out to me, 'Are you okay?,'" the book states.
The experience made her feel "naked for the first time that day", she said.
"I pushed my chin forward and shrugged, avoiding eye contact, feeling the heat of humiliation pump through my body," she said. "I didn't react – not really, not like I should have."
Martel confirmed the incident, the report said.
"I remember the moment that he grabbed her breasts," she said. "One in each hand. He was standing behind her as they were both in profile. I screamed in my very aggressive Brooklyn voice, 'What the f*ck are you doing, that's it! The shoot is over!!'"
The director said Thicke had been drinking, apologised "sheepishly" and was "contrite" about the incident afterwards.
"I don't think he would have done this had he been sober," she said.
It's not the first time Blurred Lines has created controversy.
The Marvin Gaye estate won a $5 million lawsuit against Thicke saying the song was lifted from Gaye's 1997 hit song Got To Give It Up.
Sexual harm - Where to get help
If it's an emergency and you feel that you or someone else is at risk, call 111.
If you've ever experienced sexual assault or abuse and need to talk to someone, contact Safe to Talk confidentially, any time 24/7:
• Call 0800 044 334
• Text 4334
• Email support@safetotalk.nz
• For more info or to web chat visit safetotalk.nz
Alternatively contact your local police station - click here for a list.
If you have been sexually assaulted, remember it's not your fault.
