Heidi Montag and her husband biggest mistake may claim to be living in domestic bliss — but a frequent visitor to the couple’s house claims Heidi is being virtually held hostage there!

“Heidi has been allowed to leave the house only three times in the last month,” the source tells Life & Style. And Spencer’s even moved a guard into the house. “He’s let one of his new friends, a former Marine named Paul ‘Cougar’ Zank, move in with them. He’s staying in the guest room,” a second insider says. “Heidi’s upset about it, but Spencer doesn’t care.”

In this never-before-seen photo of their actual home far from Hollywood in LA’s Pacific Palisades area, the kitchen and living room can be seen filled with Spencer’s crystals, stacks of his screenplays and garbage everywhere.

“Their four dogs aren’t housebroken,” says the source. “They go to the bathroom all over the house. Heidi is sometimes near tears at the dogs’ mess, but Spencer just orders her to pick it up.”

For his part, Spencer says, “It’s true, I do have a Marine in the house. He’s helping me write a script. And yes, we’ve been out of the house only three times this month, but that’s because I’m busy working on several business ventures.”

Credit: Faded Youth Blog

Showing off her newly remodeled figure, Heidi Montag was busy flaunting her bikini body in Las Vegas, Nevada on Saturday afternoon (April 10).

The "Hills" hottie posed for pictures at Aria at CityCenter before removing her beach cover as she grabbed up a lounge chair at the popular Sin City destination, Liquid Pool.

In related news, Miss Montag and husband Spencer Pratt took time a few days prior visiting Marine Corps facility Camp Pendleton in San Diego County.

Telling of the trip, Heidi and Spencer told People magazine, "We went to visit Camp Pendleton to see the Marines. They’re the most valiant, honorable and courageous men and women in the United States. It was one of the best days of our lives."

The MTV reality star couple adds, "Our freedom is so important to us and thanks to these Marines we get to be the entertainers we are. We wanted to take the time to honor them and pay our respects to the Marines who make this country and nation possible and allow us all the freedoms that we enjoy."

Credit: Celebrity Gossip

Click here for pictures of Heidi Montag's arrival to Liquid Pool.

Credit: Pop Sugar

Just what haven’t Heidi Montag and Spencer Pratt done lately? The reality couple traded Hollywood for a day at the West Coast’s largest Marine Corps facility, Camp Pendleton, Thursday in San Diego County.

"We went to visit Camp Pendleton to see the Marines. They’re the most valiant, honorable and courageous men and women in the United States," Heidi and Spencer tell PEOPLE exclusively. "It was one of the best days of our lives."

"Our freedom is so important to us and thanks to these Marines we get to be the entertainers we are. We wanted to take the time to honor them and pay our respects to the Marines who make this country and nation possible and allow us all the freedoms that we enjoy."

The duo spent the day touring the entire base, spent time visiting with the Marines and took meetings.

"We wanted to find out how we can bring the awareness to these true heroes that don't get the recognition and honor they deserve," says the couple.

Montag was so touched, she and Pratt plan to return shortly. She plans to perform her single "Body Language" for 60,000 Marines on the beach at Pendleton on the Fourth of July.

The two even added a new puppy to their brood to commemorate the special day in their lives.

"We named our new member of our family in honor of one the most courageous dedicated humans have ever come in contact with – our pup's name is Sgt Major Kasal," whom they met at Camp Pendleton. 

Credit: People