The Voice and Big Brother presenter Emma and her husband of seven years Matt already have two children together - daughter Isabelle, six, and son Ace, four.
Fans have been eager for an announcement of the birth after Emma's recent appearance on This Morning, during which she teased their arrival would be 'just a few days yet'.
Even though she'd previously revealed that her due date was 4th May, the new mum was keen to keep the arrival a secret for a few days, revealing the happy news on her Twitter account four days after her baby was born.
Emma was pictured showing off her impressive baby bump during a trip to the BBC Radio 2 studios in April
She didn't keep fans waiting on news of the sex and name though, announcing they'd welcomed a baby girl named Trixie and even gave a nod to her very special Star Wars birth date!
'Thank you so much for all your lovely messages. Trixie arrived in the world on Wednesday. May the 4th be with her indeed!' the 40 year old said.
Thank you so much for all your lovely messages. Trixie arrived in the world on Wednesday. May the 4th be with her indeed!— Emma Willis (@EmmaWillis) May 8, 2016
Her husband Matt later confirmed the news and revealed the middle name of their daughter, with a sweet message on Twitter that gave fans a glimpse into their new life as a family of five.
'What an amazing day! 33 today and Was sat at home in the sun with my wife and 3 kids! Perfect! Welcome to earth Trixie Grace.'
What an amazing day! 33 today and Was sat at home in the sun with my wife and 3 kids! Perfect! Welcome to earth Trixie Grace.— matt willis (@mattjwillis) May 8, 2016
The messages of congratulations have been rolling in for the pair, with one Twitter user commenting: 'aw so cute! Massive congratulations to you and Matt', while another added: 'aww congratulations! May the 4th be with her 😂💕😘 such a cute name! Xxx'
Matt, who is due to go on a reunion tour with his Busted bandmates James Bourne and Charlie Simpson in the next week, has spoken previously about his excitement at becoming a dad for the third time.
Emma and Matt have been married since July 2008
'I can't wait for the baby. Emma is due on the fourth of May and we go on tour on May 11, so we're cutting it pretty fine, but it will be fine', the 32 year old told Mail Online. 'I'm really stoked about it, I can't wait!'
The pair originally announced their exciting pregnancy news just before Christmas, confirming her due date was 4th May, so it looks like Trixie arrived right on time.
Congratulations Willis family!