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Britney headed to her favorite burger spot, Johnny Rockets in Calabasas, this afternoon to celebrate her taping of Glee with her own little Gleeks Sean and Jayden!

Boyfriend Jason Trawick was nowhere in sight but that didn't slow down Brit ... she was in high spirits, according to our photographer: "Britney was looking SO great -- what we saw of her today and on Monday in those short shorts is just amazing. She looks 18 again! She was so excited to be with Sean and she was in a really good mood."

So what's the next television project for Brit? She's done Will & Grace, How I Met Your Mother, she'll guest-star on Glee -- we'd love to cast her in True Blood! Or how about a walk-on in Jersey Shore?!