The celebration reportedly took place at a shack close to an open sewer.
However, the 11-year-old will soon move into a flat in Mumbai with her family.
'It is the happiest I have ever seen Rubina,' the Daily Star quoted family friend Dinesh Dubey, as saying.
Rubina had learnt her date of birth only after she applied for a passport to travel to the Oscars last year.
'There is more to India than just Slumdog Millionaire'
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Now Slumdog Millionaire at the Grammys