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9:45 AM PT -- Demi\'s rep says she returned home shortly after her ER visit and is "feeling much better."

Demi Lovato was hospitalized Tuesday for a nasty lung infection ... TMZ has learned.

We\'re told a friend took Demi to the ER at Providence Tarzana Medical Center because she was having significant trouble breathing.    

Doctors did a bunch of tests and decided her problem was flu-related. They gave her medication, including a Z-Pak.

As of late Tuesday afternoon, we\'re told she was still at the hospital.

The timing sucked, because Demi is recording an album and she had studio time Tuesday with a big producer and she had to cancel.

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