Nicole Richie broke down in tears at a party on last week after coming face to face with her ex-boyfriend and his new girlfriend. 'The Simple Life' star only broke up with her childhood sweetheart Brody Jenner a few weeks ago and he is already dating 'The Hills' star Lauren 'LC' Conrad who was with him at the Target party at hip Los Angeles club Area. A source told Life and Style magazine: "Nic is furious. She said: 'LC just keeps saying hi to me over and over again. I can't stand it! It's like she's rubbing it in my face. Just leave me alone!' "Party goers said Jenner couldn't keep his hands off LC, which was heartbreaking for Nicole to watch. But the 25-year-old was consoled by her former fiance Adam 'DJ AM' Goldstein who was performing at the event. The source said: "Nic went up to his booth and got a big hug. They whispered to each other, and DJ AM was able to turn her night around. By the time she stepped away from his DJ booth back into the crowded club, she was all smiles again."