The couple were spotted getting close as they sat on the grass outside the Dockyard Bar in Media City on Friday night.
They enjoyed the warm weather as they embraced, surrounded by cast and crew members from the soap.
Producer Kate became producer on Corrie in 2016 and has been known for her dark storylines.
Jack was spotted with a beer in hand, and was also seen carrying two pints over to the grass, presumably for Hanni and himself.
Hanni wore a red dress, while Jack looked casual in a grey t-shirt as they sat on the grass and enjoyed the evening with their pals.
Jack began dating Hanni in 2017 following his split from fiancee Lauren Shippey after 15 years together.
Earlier this month he hinted that he was engaged to Hanni after a holiday to Greece together.
Jack appeared to make the announcement on Instagram by posting a picture of the pair beaming into the camera.
He captioned the snap: “She said yes!”
The Sun Online has contacted Jack's representatives for comment.
Soap star Jack, 30, whisked Hanni off to Mykonos for a sun-drenched trip earlier in June and was spotted enjoying a romantic dinner with her there.
In October 2017 The Sun revealed Jack has split from childhood sweetheart Lauren.
The pair, who are both 29, remained friends for the sake of their son, three, and daughter, eight.
Lauren threw him out in 2011 when a DNA test revealed he was dad to a baby boy after a one-night stand with sales executive Sammy Milewski.
Jack successfully begged her to take him back and he gave Lauren a £3,000 engagement ring.
He was spotted with Hanni just weeks after their split was announced.
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