The prospective parents browsed the aisles for clothes for their little boy. A blue stripy babygro that read 'Prince in training' caught Frankie's eye while footballer Wayne had picked out a simple white top.
Frankie and Wayne both left the Mothercare store in Weybridge with a bag in hand.
The Saturdays' singer, whose baby is due in October, was a chic mum-to-be in a floaty monochrome print maxi dress which she accessorised with a bright red bag and flip flops.
The 24-year-old had reverted back to her signature short, side-swept crop after having had longer locks for the last few weeks.
With her baby bump blossoming and a smile on her face, the ex-S Club Juniors singer was a picture of health as they breezed out of the store.
In July, Frankie posted on Twitter that she had been having problems with water retention and had used reflexology to relieve the symptoms.
"It's amazing!," she wrote. "The first time in months that I've had ankles and bones in my feet!"
Last week Frankie opened up about her pregnancy and the challenges of being on stage alongside her Saturdays bandmates Una Healy, Vanessa White, Rochelle Humes and Mollie King.
"I wouldn't say I'm one of those people who feels like they're glowing", she told Now. "When you're next to everyone on stage in corsets and you're in a baggy T-shirt, it's just awkward and takes some getting used to.
"If I wasn't working and having to do photoshoots and performances, I think I'd enjoy it a bit more."
On her Twitter account, Frankie has revealed that she's been cooking up a storm in the kitchen – with an impressive rainbow birthday cake for her husband-to-be Wayne.
"My attempt to make a rainbow cake...it's a long process... Wonder what it's gonna look like inside.... Oh and taste?", she wrote.
The colourful creation turned out to be a resounding success.
"It's going down well! Success," she wrote. "Well pleased with that! Just call me Delia!"
Read the latest from Frankie's bandmate Una Healy on her HELLO! Online blog.