Rihanna is home for the holidays -- and wasted no time getting her party on with her friends and family!

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RiRi made her return to Barbados on Wednesday and was spotted at a house party late last night into Thursday's early morning hours. Her younger brother, Rorrey, threw the bash -- where Rihanna was seen drinking, mingling with friends and posing for photos.

The singer is in town for the holidays but will be heading to PURE in Las Vegas for New Year's Eve -- where she's throwing a party!

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