20-Year-Old Teen Mom Maci Bookout Caught Drinking!

By:Radar Staff

July 5 2012, Published 6:30 a.m. ET

By Alexis Tereszcuk - RadarOnline.com Entertainment Editor

Teen Mom star Maci Bookout is only 20 years old, but RadarOnline.com has an exclusive photo of her drinking a beer at a 4th of July party!

According to an eyewitness at the party in Chattanooga, Tenn., held on July 3 at Maci's aunt's house, the underage reality star was boozing it up!

"I saw her drink a lot," the eyewitness said. "She had at least 6 beers and she was at the party for four or five hours."

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When someone asked the MTV star why she was drinking alcohol, she giggled and said "I'm almost 21."

Maci was at the party with her parents and her young son Bentley, but according to the party-goer, "the more she drank the less attention she paid to her son. Her parents were there taking care of Bentley and her."

Luckily Maci wasn't driving, but she definitely seemed drunk the source said.

"If you said boo to her she would laugh. She was rambling about her TV show, saying that she didn't make a lot of money there but that she has a lot of other opportunities now."