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Whoa! An insider tells Life & Style this breaking story...

During a cast photo shoot to promote the final season of The Hills, show creator Adam DiVello came up behind Heidi Montag and "grabbed her with one hand on her stomach and one hand directly on her butt cheek," claims the insider.

Heidi's six bodyguards took his hand off and moved him away, but the reality star still refused to go ahead with the shoot.

The insider also says that Heidi felt Adam had been "getting a little creepy" for a while. "Adam wasn't on set much for six seasons until Heidi got her new boobs. And now he shows up everywhere."

After an email to the production team went ignored, Speidi now plans to sue. "Heidi's been in tears about it and is really upset because she says she doesn't feel safe," the insider adds.

Meanwhile, co-star Lo Bosworth Tweeted this earlier: "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."

Think this incident really happened???