Good Riddance! Inside Mischa Barton's Backstage Meltdown After 'DWTS' Elimination

Mischa Barton was eliminated from ABC's hit dancing competition show Dancing with the Stars last night after only three episodes into Season 22. But instead of being a good sport and congratulating Nyle Dimarco – the 26-year-old deaf former ANTM winner that scored the highest score of the season thus far – RadarOnline.com has exclusively learned that the O.C. has-been threw an epic backstage meltdown!

"Mischa was the only one to not congratulate Nyle on his fantastic dance performance," a on-set source told RadarOnline.com.

Although Barton, 30, seemed composed when it was announced that she would be leaving, the source said that backstage was a different story!

"She acted so rude after the show ended last night," the inside claimed.

"Mischa did not even seem to want to say goodbye to anyone. There were hardly any hugs or farewells."

"Misha just never seemed into it from day one," the insider claimed. "And her behavior certainly didn't win her many friends on set."

As RadarOnline.com previously reported, Barton will get paid for appearing even though she didn't make it to the end.

Now, the source said, "Some people are claiming that Mischa is the most self-entitled and rude celebrity that the employees of the show have ever had to work with!"