London, Feb 21 (IANS) Socialite Paris Hilton's 29th birthday bash turned ugly when her boyfriend Doug Reinhardt got into an argument with her ex, Brandon Davis.

The onlookers were stunned after the heiress and Reinhardt began arguing in the middle of New York hot spot Tea Room Thursday which led to a furious Hilton walking out of the venue.

The situation turned worse later when Reinhardt was at the centre of another argument with oil heir Davis, who was once romantically linked to Hilton, reports contactmusic.com.

According to reports, Reinhardt was said to have been angry after Davis arrived unexpectedly and appeared to be inebriated.

'One minute, Paris and Doug were looking all loved up; the next minute, they started bickering. Doug didn't seem happy about all the attention she was getting. Paris started to pout and gave him some girly punches in the back before storming off,' said a source.

'The next minute Doug was shouting at Brandon. The music was so loud that we couldn't hear what he was saying, but he then got Brandon thrown out of the door,' the source added.

But Hilton patched things up with Reinhardt and ended the night with a smile.