Britney Spears celebrated her big TV comeback Monday night with a dinner date with her bodyguard and a female friend in Beverly Hills.

Throughout her meal at Italian restaurant Dominick's, Spears, 26 — who did not drink — spoke in her British accent, a fellow diner tells sources.

"She looked so good, completely normal," the eyewitness adds. "She was smiling and laughing in the loud obnoxious Britney laugh."

The singer had a good reason to rejoice: Her cameo on CBS' Hot I Met Your Mother helped the show earn its highest ratings ever!

(Mother spiked to a series high 4.5 preliminary rating among adults 18-49, according to the Hollywood Reporter.)

Critics also praised her performance.

"She looked beautiful and had screen presence," Charna Halpern, artistic director of Chicago’s Improv Olympic Comedy Club, tells sources. "Even when she was behind the desk and they made her look kind of homely, she was adorable."