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Who knows, but these pics are making us melt!

Rihanna's cousin Noella Alstrom just gave birth to a baby girl, and over the weekend the R&B superstar stopped by to say hi to the newest member of her family. RiRi, who is still absent from Instagram, tweeted several photos of her newborn niece, and she looks right at home with the tiny infant cradled in her arms.

“My everything,” she captioned in one shot, adding in another, “I can’t get enough, I’m so in love.”

Rihanna may not be seriously involved with a man at the moment (though she did grab a bite to eat with Chris Martin on Sunday), but we have to wonder if she's been bitten by the baby bug...