The Little Mix singer gave birth to the couple's first child last month.
The singer is overjoyed to have a "little Little Mix" in the world.
The singer and her boyfriend Alex Oxlade-Chamberlain announced news of their new arrival on Instagram.
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The singer posted a string of photos of herself and her bandmates celebrating their historic Brit Awards win on Instagram.
They are the first all-female band to win Best British Group, and also shouted out the girlbands who came before them.
It was also the band's first time at the event since the departure of bandmate Jesy Nelson.
"Future best friends pending."