Parents of Lauren Spierer mark birthday on Twitter

Lauren Spierer
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Tuesday is the 21st birthday for missing Indiana University student Lauren Spierer.

Her parents sent out an emotional message on Twitter Monday night to mark the day. 

The tweet says, "Sending you love as we celebrate your birthday in a few hours, Lauren.  We will celebrate you every day until you come home."

Spierer disappeared after a night out with friends in June.

Each month is a painful milestone for her parents as there are no answers to her disappearance despite thousands of tips. No arrests have been made in the case.