Fresh off the season finale of The Voice
, Christina Aguilera
was able to squeeze in a relaxing night out with son Max and beau Matt Rutler.
The trio dined at Wolfgang Puck's fancy eatery at Hotel Bel-Air on Saturday.
Although the meal had a low-key vibe, an onlooker says the food was on the "sophisticated" side.
"They had dishes such as caviar while chatting through their meal," the source tells PEOPLE. "They looked very happy while enjoying their quiet family dinner in one of the restaurant's alcoves." – Jennifer Garcia