The Good Morning Britain presenter – an ardent Palace supporter – accompanied Parish as the south London side took on Premier League rivals Chelsea at Stamford Bridge.
However the pair looked sombre after watching their struggling side, currently 14th in the league, concede a first half goal to Chelsea's Spanish striker Alvaro Morata.
Side by side: Susanna Reid joined Crystal Palace chairman Steve Parish on Sunday afternoon
According to The textbacklinkexchanges.com, the presenter, 47, has been dating the businessman, 53, for two months after the pair bonded over their mutual love for the football club.
A source explained to the publication on Saturday: 'They have real chemistry.'
It was also reported that Susanna has been on a number of dates with Steve, rumoured to be worth around £45m, and it was suggested that they've also been on a romantic mini-break together.
Coming out: This appearance is their first public appearance
A close eye: This follows claims the pair have been secretly dating for months
Steely: The pair weren't giving anything away as they kept their faces rather stern
Close: The appearance seems to have clarified the whisperings about the supposed couple
The pair are said to have gone out for dinner together, as well as enjoying cinema trips and dates in Selhurst Park to show their support for Crystal Palace FC.
Susanna and Steve were spotted heading to the stadium prior to the Premier League match between Fulham FC and Crystal Palace at Craven Cottage in August.
MailOnline has contacted representatives for both Susanna and Steve for comment.
Susanna separated from her partner Dominic Cotton in 2014, after being with him since 1998, and following her appearance on Strictly Come Dancing in 2013.
Watching on: The match was taking place at Stamford Bridge
Supporting her team: The Good Morning Britain presenter – an ardent Palace supporter – accompanied Parish as the south London side took on Premier League rivals Chelsea
Not happy: However the pair looked sombre after watching their struggling side, currently 14th in the league, concede a first half goal to Chelsea's Spanish striker Alvaro Morato
Chit chat: The pair talked closely as they watched the game on the pitch
Eye eye: Steve watched his supposed love as she kept a firm eye on the action on the pitch
She’s been a single mother to sons Sam, 16, Finn, 14, and Jack, 13 since splitting with her ex in 2014 after 16 years together.
They never married, a legacy of what Susanna has previously described as a ‘choppy childhood’ following her parents’ divorce.
Her relationship was rumoured to have been put under strain after the BBC moved its breakfast show to Media City in Salford in 2012.
There were then cries of the ‘Strictly curse’ when they announced their split soon after Susanna’s gloriously frisky performance in a 2013 runner-up turn with pro dancer Kevin Clifton (she denied the dance show had anything to do with it).
Rumour mill: It was reported that Susanna has been on a number of dates with Steve
Secret Romance: The pair have been a rumored pair since August
Blissful: It was also suggested that they've been on a romantic mini-break together
Outings: The pair are said to have gone out for dinner together, as well as enjoying cinema trips and dates in Selhurst Park to show their support for Crystal Palace FC
Today, she and Dominic are good friends and ‘fairly relaxed parents’ to their sons, who she describes as ‘pretty chilled guys.'
Susanna revealed last week that she is ready to start dating again, and also said that she aimed to see several suitors at the same time.
In an exclusive interview in You magazine, she exclaimed: 'I'm back in the game! I'm definitely open to dating again. This is the right time.
Previous relationship: Susanna separated from her partner Dominic Cotton (pictured) in 2014, after being together for 16 years, and they share three sons together
'The great thing about what's happened in 2018, and everyone will have seen it on Love Island, is you don't have to date exclusively any more.'
However, her modern approach doesn't extend to using internet dating or apps such as Tinder. She says: 'Oh my God, I'm not online. It doesn't feel like the right thing for me.'
After her split from Dominic, she had not sought a new partner but concentrated on bringing up their sons.
'I've spent a significant amount of time since the split focused on the children and on work,' she says. But now they are teenagers she feels ready to resume dating.
'Back in the game': Susanna previously revealed that she is ready to start dating again, and also said that she aimed to see several suitors at the same time