Vocal superstar Mariah Carey almost had a surprise present on her birthday after experiencing contractions. 

The 'Obsessed' singer took to Twitter just before 9am GMT, March 27, and revealed that her twins were very close to making a festive appearance:

"So #dembabies really wanted 2 celebrate w/us/share the anniversary! 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!!! We have a few more weeks 2 go but- wow!!!: ) #soreadyallready!"

Watch the moment she announced her pregnancy on national television here: