Michelle shared the happy news on her 32nd birthday by, you've guessed it, using the celeb website of choice, Twitter - but not before she had given OK! magazine the exclusive first.
After the magazine hit the shelves, Michelle posted the sweet tweet:
'Happy birthday/1st yr anniversary/ and mummy day to me! I can feel it doing press ups already! LOL! Best bday present ever! Xxx.'
The singer popped back on a little while later to reveal she's 13 weeks pregnant, and to thank her fans for all the lovely messages she received:
'Thank you all of you, but like every normal mummy to be on her birthday/anniversary...I am knee deep in cleaning our apartment.. LOL. X'
Michelle is due in January.