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The Little Mix star, 27, announced the news on Monday afternoon, just days after bandmate Leigh-Anne Pinnock also announced she is expecting.
"So happy to be on this wild journey with my soulmate," Perrie wrote.
"Me + Him = You. We can't wait to meet you baby Ox!"
Perrie shared two images, one of her growing baby bump and a second with boyfriend and Premier League footballer Alex Oxlade-Chamberlain.
Alex also shared the snaps, writing: "Anyone got any advice on how to change nappies? So grateful and excited to become a dad bring on the sleepless nights."
And fans are so excited for the pair, with one commenting: "CONGRATS PERRIE OMG."
While another said: "Omg congratulations, beyond happy for you."
And a third added: "OMG i can't even breathe. Congratulations!!!!!!!"
Perrie didn't share how far along she is, or when she's due, but her announcement comes just days after Leigh-Anne revealed she is also expecting her first baby with fiancé Andre Gray.
The 29-year-old debuted her bump in a series of snaps from a pregnancy photoshoot, where she wore emerald green flowing robes and a matching bandeau crop top.
She captioned the post: "We've dreamed about this moment for so long and we can't believe the dream is finally coming true... we can't wait to meet you."
The news comes just days after the band released the official video for Confetti, which saw Leigh-Anne, Perrie and Jade team up with the stars of RuPaul's Drag Race UK.
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