The casually dressed star stepped out into the LA sunshine with her friend, and looked relaxed as they said their goodbyes after the meal.
Amanda, who burst onto our screens in the musical Mama Mia in 2008, is reported to be joining her Les Miserables costars on stage at the Academy Awards to perform some hits from the movie.
Rip it up: Amanda Seyfriend wore a casual outfit for lunch at Ceccioni's in West Hollywood on Thursday
Scruffy: The actress's jeans were torn at the knee
Les Miserables picked up three awards at the Golden Globes on Sunday, and Amanda has spoken of the strict regime she took on to land a role in the movie.
The actress, 27, was so determined to be involved in the production that she changed her lifestyle, giving up caffeine, dairy and alcohol.
Amanda said that landing a part in Les Miserables was a dream come true, as she has been obsessed with the musical since she was a child.
She said: 'I was only 11 when I first saw it, and ever since I've been hoping and wanting to be a part of it. Playing Cosette is proof that life has a way of making things come full circle if you want something badly enough.'
Amanda started training with a voice coach in August 2011 in preparation for the role, and said,'I wanted the role more than anything I've ever wanted in my life.'
Her upcoming role in Deep Throat is a far cry from the pure and virginal character she portrays in Les Miserables.
She plays American porn star Linda Lovelace in the biopic, which costars Sarah Jessica Parker, Sharon Stone, Chloe Sevigny, Chris Noth and Hank Azaria. James Franco plays a young Hugh Hefner in the movie.
Kate Hudson was originally asked to play Linda, until it was announced last November that Seyfried was up for the role.
Fed up? The 27-year-old holds her stomach as she waits for the valet outside the restaurant, and her friend texts on his cell phone
A farewell peck: Amanda kisses her friend goodbye as they leave the West Hollywood restaurant