Luke wore a yellow shirt over a white tank top, whilst Antonia chose a backless aqua dress.
They held hands as they left the Netflix drama’s after-party in London on Wednesday.
Antonia, 23, who has performed on Dancing on Ice and Greece’s Got Talent, was first linked to Luke in April.
They were spotted together but neither had confirmed the relationship until now.
Fans had been convinced Luke was pursuing a romance with co-star Irish star Nicola Coughlan, 37, after they displayed chemistry on and off screen.
SplashLuke wore a yellow shirt over a white tank top[/caption]
SplashAntonia chose a backless aqua dress[/caption]
SplashThey held hands as they left the Netflix drama’s after-party in London on Wednesday[/caption]
SplashAntonia has performed on Dancing on Ice[/caption]
SplashShe also appeared on Greece’s Got Talent[/caption]
SplashShe was first linked to Luke in April[/caption]
SplashThey were spotted together but neither had confirmed the relationship until now[/caption]
SplashFans had been convinced Luke was pursuing a romance with co-star Nicola Coughlan[/caption]
SplashAntonia stunned in her aqua dress[/caption]
SplashThe couple are pictured holding hands[/caption]
SplashAntonia has more than 8,000 followers on her Instagram[/caption]