According to the Sun, witnesses claim they spotted the comedian and professional dancer drinking and kissing every night before images emerged.
One pub-goer told the publication: “Katya and Seann came in to the pub every night that week at about 9.30pm.
“They weren't wearing workout gear when they came in and didn't seem to be coming from the dance studio round the corner.
“They looked like a normal couple - really comfortable with other and they were quite tactile with each other at bar.”
The insider added: “No one knew who they were and they really kept themselves to themselves, choosing to sit outside.
“Katya was drinking gin and tonics and Seann was being a gent bringing the drinks out.
“They were in deep conversation and seemed really into each other stopping to kiss a few times.
“They didn't really seem worried about anyone seeing them but they stood out because it's a local boozer and everyone knows everyone.”
Standard Online has contacted representatives of the pair for comment.
Walsh addressed the criticism around the snaps on Strictly Come Dancing spin-off show It Takes Two on Wednesday, saying that he is “not perfect” and apologising for his indiscretion but stressing he is “not the person he is being portrayed as”.
Walsh, 32, told Zoe Ball: “We were getting on well, we were having fun. We had a couple of drinks and made a huge mistake and I regret it deeply.
“First of all I would rather not be having to address this publicly but I feel like I have to. I made a mistake which I am very sorry for and for the hurt that I have caused.
“You never think about the extent of the damage you’re going to do in that moment. I’m not perfect, far from it. Our relationship wasn’t perfect, that doesn’t’ mean I wanted it to end the way it did. I’m sorry for that.”