Sean's new girlfriend already looks at home in the Stewart clan, chatting to the 65-year-old singer as the group climbed the stairwell into the Toyota Sports Centre in El Segundo.
Rod Stewart's family showed a united front as they met up at an LA Kings hockey game to cheer on son Liam on Sunday.
The rocker looked every inch the proud father-to-be as he and Penny snuggled against each other, laughing and smiling.
Rod held his wife's hand and protectively placed his hand around Penny's growing belly, as they happily posed for photographs and chatted with other stars including Don Johnson and Gladys Knight.
Sean and his pretty blonde girlfriend earlier waited outside the stadium with Liam's mother Rachel Hunter.
