Frankie Sandford's baby bump watch

The Saturdays Frankie keeps an eye on Una Healy's growing tummy

Frankie took to her Twitter and posted a picture of herself measuring band mate Una Healy's baby bump.

"I've been very impatient for Unas bump to show." wrote Frankie "I've come back and it's finally here! The Sats baby is growing!!!!! :)".

Healy is expecting her first child with England rugby union player Ben Foden, with whom she's had a relationship since 2008.