Cory Monteith would have turned 32 on Sunday -- and former girlfriend Lea Michele celebrated with a touching Twitter tribute.

The actress posted a photo of the two of them yesterday, showing them laughing together.

"The biggest heart and most beautiful smile.. In all of our hearts.. We love you so. Happy Birthday," the "Glee" star tweeted with the picture.

Monteith was found dead in his Vancouver hotel room back in July, after an overdose of alcohol and heroin -- but Lea says that's not how he'll be remembered.

"I have happy memories of Cory. He was not his addiction – unfortunately, it won," she told Seventeen back in March. "But that wasn’t who he was. Cory made me feel like a queen every day. From the minute he said, ‘I’m your boyfriend,’ I loved every day, and I thank him for being the best boyfriend and making me feel so beautiful."

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