Pregnant Mariah Carey Has a False Alarm on Her Birthday

It's been an emotional day for Mariah Carey. 

Not only did the singer who's expecting twins turn 41 today, but she also had to go to the hospital late last night after starting premature labor.

"So #dembabies really wanted 2 celebrate w/us/share the anniversary!" Mimi wrote on her Twitter page Sunday morning. "I started having contractions last night..went 2 the hospital. Finally they said I could come home after they got it under control. But they almost came on 3/27- happy anniversary in deed!!!"

Mariah, who noted she has a few weeks to go in her pregnancy, seems like she's all set to give birth, tweeting, "soreadyallready!"

Mimi's husband Nick Cannon is equally excited. Cannon, 30, tweeted last week: "I am probably going to faint in the delivery room! I need to man up! Or maybe I should say WOMAN UP since they are the ones that have to be the strongest in the whole ordeal! I am in awe of my wife!"

Happy Birthday, Mariah! Don't worry, the twins will be here in no time!