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Selena Gomez is a big sister - according to her good friend Demi Lovato, who broke the news through Twitter Thursday.  Demi took to the site with the information, asking followers to "congratulate her and her family" with a special hashtag. 

It was just last month that Selena herself shared with fans that her mother, Mandy Teefey, was expecting.  Selena's parents were divorced when she was five, and Mandy got remarried to her current husband in 2006.  The occasion is particularly special as the couple was previously expecting back in 2011 but miscarried a month after going public with the news.  

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