The Sweet Melody singer announced that she and her fiancé, footballer Andre Gray, were expecting on Tuesday afternoon, with a pregnancy photo-shoot posted on her Instagram page.
“We’ve dreamed about this moment for so long and we can’t believe the dream is finally coming true,” the chart-topping star wrote.
Addressing her unborn child, Leigh-Anne added: “We can’t wait to meet you.”
Perrie added: “I can’t stop staring at these pictures. You’re a vision. Ily both so much! CONGRATULATIONS my beautiful sister!”
The happy couple also received messages of support on Instagram from Radio 1 presenter Clara Amfo, Stranger Things star Millie Bobby Brown and fellow X Factor winner Alexandra Burke.
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Leigh-Anne and Andre have officially been dating since 2016.
The pair announced they were engaged during lockdown last year, after the Watford FC player proposed on their fourth anniversary.