She ditched her make-up for a fresh-faced look and had a short, choppy hairdo.
Rita hung out with pals on the impressive vessel, documenting her trip on social media.
Earlier this month The Sun revealed Rita has been dating Rafferty Law after hitting it off on the set of the Oliver! remake.
An insider said: “It has been simmering for some time after they started working together.
“People made a few comments about the chemistry straight away and the gossip started from there. But it was only after a while that the attraction really grew into something meaningful between them.
“Now it’s a proper relationship so they decided they were ready to go out as a couple for the first time. They couldn’t help holding hands as they left. It’s still early days but they’re pretty loved-up right now.”
Rita, who plays Dodge in the film, is six years older than leading man Rafferty, 23, son of Hollywood lothario Jude Law and actress Sadie Frost.
He has had success as a model for top clothing brands including DKNY but his role as Oliver is his first major film role.
Rita has been enjoying growing success on the big screen after appearing in blockbuster Fifty Shades Of Grey.
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