The singer is overjoyed to have a "little Little Mix" in the world.
Leigh-Anne surprised fans with the news she and footballer Andre Gray have become parents to two babies.
Drunken Fun, X-Rated Gossip And Sisterly Solidarity: 20 Times Little Mix Were Truly Friendship Goals
In the last 10 years, Little Mix's friendship has shone as brightly as their talent.
England captain Harry Kane also tweeted: "If you abuse anyone on social media you’re not an England fan and we don’t want you."
If you thought Little Mix's recent baby news might be making Jade broody... you should probably think again.
The singer's fiancé, footballer Andre Gray, gave her the £40,000 ring when he proposed last year.
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.