Songstress Christina Aguilera, 26, poses on the red-carpet before hosting a party at LAX Nightclub at the LUXOR Hotel and Casino in Las Vegas. She expects her first child in early January, and Paris Hilton announced the news publicly for Christina last night -- seemingly to her chagrin. Although Paris and Christina were seen chatting earlier, and Paris rested a hand on her belly, Christina did not expect Paris' 'Congratulations to the most beautiful pregnant woman in the world. You're gorgeous' announcement over the loudspeakers of the club. According to People, Christina appeared temporarily shocked as she sat in her perch in the elevated VIP booth. She sank her head into the shoulder of husband Jordan Bratman as her friends looked stunned. But she quickly recovered, and the two looked at each other and laughed as the crowd -- which included Adrien Grenier, Melanie Brown, Criss Angel and cast members from The Hills -- erupted in applause. A rep for Christina declined to comment on the pregnancy.