The singers are both expecting babies in the new year, however it hasn't stopped them from getting festive and creative with their costumes.
Last night, the Big Reunion bands took to the stage in Nottingham and delivered a knockout show, singing our favourite songs from times gone by.
Atomic Kitten star Kerry is expecting her fifth child and dressed her bump in a slinky black halter-neck dress with silver glitter.
At one point, the star's bandmates gestured to the audience about Kerry's pregnancy, with Natasha Hamilton placing her hand on her growing tummy.
Reveal's Christmas cover star Michelle, meanwhile, who is due to give birth to her second baby in March, also shimmered in not one but two sparkly numbers!
The Liberty X singer wowed the crowd with a long gold sequinned gown, which featured a dramatic side split, along with a black glittery stretch jumpsuit.
After announcing her pregnancy in September, Michelle joked that she wouldn't be able to wear the band's trademark PVC catsuits during the festive tour.
Well, it seems you've found a fab solution, Michelle!
On Sunday, the Big Reunion bands - who also include 911, The Honeyz, B*Witched, 5ive and Blue - release their Christmas charity single, 'Wish It Could Be Christmas Everyday'.
The groups are hoping to raise thousands of pounds for this year's Text Santa appeal - and bag the Christmas No1!
Watch the video for 'Wish It Could Be Christmas Everyday' here: