Lea Michele and Cory Monteith grab lunch in West Hollywood on May 12, 2012. Credit: National Photo Group

Lea Michele let it all hang out in West Hollywood Saturday.

The Glee actress, 25, went braless during a lunch date with costar Cory Monteith, 30, at Canter's Deli. Wearing a low-cut white tank top, jean shorts and a long black cardigan, Michele wrapped her right arm around Monteith's waist on their way out of the restaurant.

The night prior, Monteith celebrated his birthday with A-list pals Chord Overstreet, 23, Lily Collins, 23, Zac Efron, 24, and Zelda Williams, 22. The actor tweeted that he was "completely overwhelmed" by all the "lovely birthday wishes" he received via Twitter.

Costars-turned-couple Michele and Monteith recently finished filming the third season of Glee. "It's impossible to say how much Glee means to me. This year has been so amazing and I cannot wait for next year. It's going to be great," Michele tweeted Friday. "Can't wait to have an amazing summer and see what's next for Rachel Berry in Season 4!"

The show's fourth season will move to Thursday nights this fall; Sarah Jessica Parker, 47, and Kate Hudson, 33, will join Glee's growing list of A-list guest stars, FOX announced Monday.