Rock Bottom! Heidi Montag Admits Drunkenly Puking On-Air Was 'Lowest Point'

Heidi Montag turned to alcohol to calm her nerves before facing her estranged mother on the premiere episode of The Mother/Daughter Experiment: Celebrity Edition. After raising "red flags" by showing up to the house inebriated, the reality star exclusively revealed to RadarOnline.com the truth behind her worse-for-wear arrival.

"Last time I was on TV with my mom, that was the breaking point in our relationship," she said, referring to when her mother publicly bashed her extreme plastic surgery transformation on The Hills. "I was just a little too nervous and drank a little too much."

Despite having "a shot" before entering the house and vomiting during dinner, Montag, 29, confessed that she does not have an alcohol abuse problem.

"I hardly drink in real life," she defended. "I didn't have food or water that day so obviously I didn't handle it the best. That was certainly my lowest point in the house."

But her mother Darlene Egelhoff thought differently when she witnessed her daughter's drunken behavior.

"Heidi's been drinking to deal with stress," Egelhoff said on the show. "Which is a red flag for me."

Montag explained how her mother worried she could have a dependency to alcohol because she is an addiction counselor.

"That's what she studies and lives," Montag said. "She is also concerned with her career going on the show. She wants to make it clear, 'I'm an addiction counselor.'"

Although the reality star's issues with her mother are one of the most extreme in the house, she is grateful her problems aren't as severe as co-star Courtney Stodden's.