"Glee" star Cory Monteith is done with rehab after a month of completing treatment for substance abuse. Monteith who stars as Finn Hudson in the hit Fox show voluntarily admitted himself into a treatment facility for substance addiction last month.

According to People the star tweeted "sending out big love to everyone. thank you for the continued support! It means the world to me! :)"

His co-star and girlfriend Lea Michele also took to Twitter to express her joy of what a great day it was following her boyfriend's completion of rehab, "Today is a great day:) Love you all! Xo."

This is the second time that 30-year old Monteith has gotten help for his substance problem. He admitted in an interview that he previously entered rehab when he was 19-years old.

A source told E! News that Monteith flew out of Antigua and to New York alone and later reunited with his girlfriend in Los Angeles.

The two were later spotted on Friday morning at LAX, checking in for a departing flight where Lea Michele was seen with her passport. Monteith was seen rocking a new haircut following his stint in rehab.

A witness told E! News that both Lea Michele and Cory Monteith seemed "very happy, smiling the entire time."

When security asked Monteith how he was doing, he said "good." Both Lea and Cory were "friendly" to those around them, says a witness, and appeared in great moods and excited to get out of town.

Following his admittance to treatment, a Monteith source told People at the time, "Lea is an excellent influence on him. She's good for him. She's really calmed him."