Taking to her Twitter page on Friday morning, the mother-of-three made the big announcement, sharing a sweet black and white picture of her daughters looking at an ultrasound photo of their new sibling.
"We are all very excited for our new baby to arrive next year !! number 4," she tweeted alongside several baby emoticons. She later thanked fans for their well wishes, saying: "Thank you to everyone for all your lovely messages!"
We are all very excited for our new baby to arrive next year !! 😍👶🏼❤️❤️❤️👶🏼🍼🍼🍼👶🏼👶🏼 number 4 pic.twitter.com/2YOV50r70N
— Alex Gerrard 8 (@AlexGerrard7) October 28, 2016
Speaking previously to HELLO!, Alex opened up about the possibility of having a little boy to follow in Steven's footballing footsteps. "I know Steven has said before he would like one but the chances of us having one is slim with having three girls," she confessed. "He laughs and says he can't risk it - it's going to cost him a fortune in weddings if we have another girl!"
The Gerrards and their daughters relocated to Los Angeles in May last year after the former England football captain, 36, landed a contract at LA Galaxy, David Beckham's former club.
Alex Gerrard and her husband Steven are expecting their fourth child together
Discussing life in the States, Steven recently told CNN that he and his family have no intentions to move back to the UK anytime soon.
"There's so much to do out here for myself and my family," he said. "It's been a smooth transition off the pitch and hopefully this year I can be a success and then I'll go away very, very happy. Whatever you want to do it's available. It's just a super place to live."