Washington, Nov 4 Mischa Barton's Halloween festivities turned sour after a fellow partygoer threw a drink over her.

Barton was having a gala time in New York on All Hallows' Eve when a man splashed her with his drink claiming that she had trodden on his foot.

According to RadarOnline.com, the 23-year-old star did not spare the man as well, soaking the boor with her drink, reports Contactmusic.

However, things turned ugly when one of Barton's pals got into a row with the guy.

A source said the man was thrown out of the party with "a gash to his head and his knee was all cut up".

Barton's rep has remained mum on the issue. (ANI)