The girl group will chronicle their bid to crack the US music market through a reality TV show, which will air on American network E!.
"Flying to L.A tomorrow for a few weeks and need to start packing!!Got help from Mrs. Mammy Healy for Aoife Belle:) nervous and excited will be v sad saying goodbye to my hubby @ben_foden :( (sic)'' Una Healy tweeted yesterday.
Rochelle Wiseman - who married JLS star Marvin Humes on the weekend - said: "Packing...I have 3 cases LOL...off to LA tomorrow for a little while!!!! What's a girl to paccckk?!?!?! LA are u ready?!?! Here we commee''
This morning, Wiseman added: "VERY emotional morning!"
Humes responded: "Hardest goodbye I've ever had to do. wishing @RochelleTheSats and all @TheSaturdays all the best in the US!! Go and smash it girls! Marv x (sic)"
An air date for The Saturdays' new reality show in the US has yet to be announced.
Watch the music video for The Saturdays' hit 'Higher' below: