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Thanks to Marvin and Rochelle's relationship, JLS are first up in congratulating The Saturdays' Una on being pregnant.
The 'She Makes Me Wanna' stars are good friends with The Saturdays after spending many a night out together because of Marv and Roch being a couple.
So on hearing the latest news that Una Healy and her boyfriend Ben Foden are expecting a baby, JB tweeted to congratulate the happy couple.
"Awwwww!congratulations @unahealy :D," he posted on the JLS Official Twitter.
"So chuffed for you and ben!BIG love,Jaybes x."
And Rochelle's boyfriend Marvin was quick to follow.
"Massive congrats to @unahealy and Ben..amazing news!" he tweeted.
"A little Saturday baby on it's way! All the best from Marv and all the boys x."
The Daily Mirror say Una is "delighted" with the news, despite the fact that it was a surprise.
The Saturdays' 'All Fired Up' tour kicks off later this year, when a new album is also due to be released.
Find out more about The Saturdays' Una having a baby.