The Glee actress, 27, chose an all-black ensemble for dinner at Dominik's Restaurant in West Hollywood on Monday evening (30 September).
Lea has been hard at work lately filming her role as Rachel Berry for the fifth series of Glee, which premiered in the US last week.
The premiere episode, which aired on 26 September, was the first to be broadcast since the death of her boyfriend and co-star Cory Monteith, who passed away following an accidental overdose in July.
His death wasn't addressed in the first episode – which was the first of a two-part Beatles special – but will be dealt with in a special third tribute episode.
Lea has been keeping fans updated on life on the Glee set, most recently sharing a picture of her filming a scene alongside Chris Colfer (Kurt), Naya Rivera (Santana) and guest stars Adam Lambert and Demi Lovato.
She added the caption: "NYC crew!"
US X Factor judge Demi has signed on for a guest arc as a love interest for Santana, while singer Adam will appear as part of the New York storyline.