The 25-year-old actress was joined at the party by her Glee co-star Jenna Ushkowitz.
Earlier in the day, news broke that the Glee seniors would be graduating from the show – but Lea tweeted that there is nothing to worry about!
“It’s official Rachel Berry will be back next year for season 4! I’m so happy you have no idea!!” Lea tweeted. “Ryan Murphy has some brilliant and ground breaking ideas for including us graduates in the show for next season! It’s going to be great!”
Also pictured inside: Jayma Mays at the party.