According to Life & Style, Montag is planning on filing a lawsuit against Adam DiVello for sexual harrassment.
A source close to Heidi tells the mag the incident occurred the last weekend of March during a photo shoot to promote the last season of the show.
"Adam came up to her from behind and grabbed her with one hand on her stomach and one hand directly on her butt cheek," the insider claims. "Heidi had six bodyguards with her. They took his hand off her and moved him away from the situation."
Heidi then refused to be a part of the photo shoot with her cast mates. But at the time, husband Spenver Pratt said Heidi "was sick and she didn't even want to go to that photo shoot."
The source goes on to say that Montag has been displeased with DiVello for some time. The friend continues, "Heidi started bringing security to the set because she felt Adam was getting a little creepy. He was very touchy-feely and she insisted he wouldn't stop asking her to strip down to a bikini for scenes. Adam wasn't on set much for six seasons until Heidi got her new boobs. And now he shows up everywhere."
"Heidi and Spencer e-mailed the production team and asked to talk about what happened. But after three weeks they'd gotten no response other than to say Heidi was allowed to bring only one bodyguard on set, the source says. "Heidi's been in tears about it and really upset because she says she doesn't feel safe. Heidi says she wanted to solve the issue behind closed doors but The Hills just wouldn't talk about it."
For someone who is really distraught, she sure seemed to be in good spirits this past weekend when she hosted the pool party at the brand new Liquid Pool at Aria Hotel in Las Vegas.
Co-star Lo Bosworth just took to her Twitter to address the rumors too. She tweeted, "I'll repeat it: no one is/has ever been assaulted during filming of our show. hey spiedi, do you know the definition of slander? NOT OKAY."
Guess it's clear whose side she's on! We have a feeling this is yet another publicity stunt by Heidi and Spencer. Sad that it has to come at Adam's expense!