LINDSAY Lohan has accused her longtime pal, Patrick “Pootie” Aufdenkamp, of stealing from her.

The Mean Girls star — who saw in 2010 on the island of St. Barth’s — reckons Patrick took one of the sketches for her new 6126 clothing line.

“Patrick stole Lindsay’s sketches for her new 6126 clothing line,” a source told Us Weekly magazine.

“He is now running off trying to do his own line. And telling people he’s going to fashion market week in NYC on February 18 to debut his line.

“It’s horrible. He was her best friend. He has always used her, and she’s been warned to never trust him. Lindsay is a good friend and likes to see the good in people. She didn’t want to believe how bad Patrick’s energy was, and how false his friendship has always been with her.”

Lohan says Aufdenkamp has been her “best friend” since she was 16. He has frequently been photographed with the actress, and was present at many meetings related to her new fashion line.

“I should’ve known better,” she said, noting that the friendship with “Pootie” has ended. “But new year for me and a new beginning! Health, happiness, success and love!”