The 'FourFiveSeconds' hitmaker's relationship with the 'Wolf of Wall Street' actor is believed to be hotting up as they are spending more and more time together in the 40-year-old star's home.
A source revealed: "It's like she's practically moved in."
The 27-year-old musician - who is currently in France for Paris Fashion Week - has been made to feel at home in the Hollywood star's Los Angeles home, being treated to her own special areas including a room specifically for her to smoke in.
The source continued: "It's like she's practically moved in. Leo has been sweet and cordoned off little areas for her in the home that are just for her, like a smoke room."
The couple were first rumoured to be dating shortly before Christmas, but their relationship has quickly gone from strength to strength and the Bajan beauty has already promised to take Leo back to Barbados next month, where he will be a guest at her cousin's wedding.
And the pair will use their trip to the tiny island to also enjoy a romantic getaway together, planning to escape for some alone time on a nearby yacht.
The insider told The Sun newspaper: "Afterwards Rihanna and Leo are going to spend a few days by themselves on a yacht."