The Only Girl (In The World) singer is reportedly planning to buy three seats on Sir Richard Branson's Virgin Galactic programme.
The 25-year-old pop superstar is on the waiting list for one of next year's expensive flights, and she hopes to take her younger brother Rorrey, 23, and a bodyguard on the out-of-this-world mission.
A source told the Daily Star newspaper: "Rihanna has already put down a deposit for the flight.
"She has been obsessed with space since she was a child so it would be a dream come true for her."
Rihanna has long been fascinated by space and her rapper-and-DJ brother lifted the lid on her obsession with aliens last month.
Rorrey revealed: "She believes there are UFOs. No one knows for sure, but Ri and I think they're out there."
Other celebs to do the same
The Diamonds singer - who is worth more than $43m - is set to join fellow famous wannabe astronauts Ashton Kutcher and his girlfriend Mila Kunis, Justin Bieber and Leonardo DiCaprio who all have confirmed seats on the Virgin Atlantic programme.
The world's first commercial spaceline is expected to launch in 2014 and more than 500 people have already paid deposits for the trips.
The Virgin Galactic website states seats are $250 000 each and many potential passengers have visited Necker Island with Branson and completed G-force training.
SpaceShipTwo was unveiled in the Mojave Desert in California in 2009.
The first ever two-hour flight in the planet's orbit will be boarded by Branson and his family and anyone who has paid a deposit guaranteeing them a place on it.
Passengers will travel 62 miles in altitude - the internationally recognised boundary of outer space - and will experience weightlessness and an incredible view of the curve of the Earth.
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