Now the pair have been photographed as a couple for the first time as they enjoyed a romantic sunshine holiday in Majorca.
Cooper, who plays ex-con Jacqui McQueen, and newcomer Scanlan, who portrays bad boy Brendan Brady, couldn't keep their hands off each other as they relaxed on the beach in Bedinat.
Loved up: Hollyoaks co-stars and real-life couple Claire Cooper and Emmett Scanlan share a kiss on the beach in Majorca
Following months of speculation surrounding their relationship, the couple's public display of affection on the beach finally confirmed their relationship.
Cooper, 29, showed off her slim figure in a black bikini as she cosied up to Irishman Scanlan, 31, near their room at the four-star Lindner Hotel.
Although the couple's relationship is an open secret on the Hollyoaks set in Chester, they have been reluctant to make it public.
Cosy: Cooper worked on her tan in a black bikini, while Scanlan protected his pale Irish complexion in a shirt and shorts
A Hollyoaks source told the Daily Star Sunday: 'They get on really well and everyone is genuinely happy for them.
'They started seeing each other last year but things turned serious between them after Valentine's Day. Emmett whisked her off to Paris and they came back more loved-up than ever.
'Claire's worried that if she talks about her personal life it will put a lot of pressure on their relationship.'
Although the couple haven't elaborated on their relationship, they frequently mention each other on Twitter.
Open secret: The couple are thought to have been dating quietly since late last year
Bad boy: Scanlan joined the cast of Hollyoaks last August, playing abusive club owner Brendan Brady
Last week, Scanlan gushed: 'To the woman who can make any camera smile and any magazine better, kill it today on your shoot Claire Cooper.
Cooper has referred to her 'boyfriend' several times, but never confirmed directly that the man in her life was Scanlan.
Last month, she Tweeted: 'A huge shout out to my bessie Jennifer Metcalfe for being damn sexy! And Emmett Scanlan for just being........ The Best Actor on TV... ;-) x.'
Trim: Cooper showed off her slim and tanned figure in a black and gold string bikini
Chillaxing: Cooper has a nap on Scanlan's chest as they relax on the sun lounger
Both are championing each other ahead of the British Soap Awards this weekend, with each of them up for a handful of awards.
Cooper is nominated for Best Dramatic Performance and Best Actress, while Scanlan is up for Best Newcomer, Villain Of The Year, Best Actor and Best On-Screen Partnership alongside Kieron Richardson.
Cooper previously dated former Hollyoaks co-star Kevin Sacre in 2007, before he met his now-wife, ex-Strictly Come Dancing professional Camilla Dallerup.
Supportive: The couple have been championing each other on Twitter ahead of this Saturday's Soap Awards
Meanwhile, Scanlan has a nine-year-old daughter Kayla from a previous relationship.
Cooper has been playing Jacqui since 2006, while Scanlan only joined the cast last August, as the brother to Cheryl Brady.
Aside from her Hollyoaks role, Cooper also co-owns clothing rental boutique The Closet with co-stars Jennifer Metcalfe and Leah Hackett.
What a difference: The couple looked a world away from their hard-faced Hollyoaks characters, ex-con Jacqui McQueen and club owner Brendan Brady