Mariah Carey's baby doll dress hides reported baby bump

Mariah Carey is still working hard to keep her reported pregnancy under wraps.

On Friday night, the songstress, 40, hosted a 200-person 30th birthday bash for hubby Nick Cannon at LAVO New York, but tried to keep onlookers guessing as to whether there was a baby bump behind her black baby doll dress.

"She definitely looked big, but I couldn't tell if she was pregnant or not because the dress wasn't tight around her stomach," our spy dished.

She also didn't walk the red carpet — leaving a white tux-wearing Cannon to complete that task alone.

"For most of the night she was relatively low-key, hanging out with his mother and commenting to people that "it was his night" and she really wanted the spotlight to be on him," the source said.

Inside, guests — including Ne-Yo and "Saturday Night Live's" Jay Pharoah — chowed down on a four-course meal that included spinach-and-artichoke pizza, Chilean sea bass and birthday cake. During dinner, Carey surprised Cannon with a video filled with messages from Carey, Cannon's mom and friends including Ne-Yo, Sharon Osbourne and Russell Simmons.

When Cannon's mom saw herself on the video, she "started crying and Nick ran over to comfort her, even wiping away her tears with a napkin," our source said.

Source:amNY