Jessica Simpson and Tony Romo
Evan Agostini/AP; Frazer Harrison/ACMA/Getty
The public display of affection was in keeping with the couple's last high profile date – Simpson's sister Ashlee's wedding, where they were "kissing and holding hands throughout the night."
Simpson and Romo shared a cozy corner booth in the restaurant where they "looked happy and were laughing and smiling," the source said.
Romo ate a Kobe burger while Simpson tucked into a steak.
They also ran into Romo's Dallas Cowboys teammate Isaiah Stanback and his parents, and "stopped to say hello to a guest on their way out and played with her beautiful baby girl," before leaving together, all smiles.
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