They're due to get married later this month.
But Nancy Shevell is already very much part of the family, having turned up with Paul McCartney to support his daughter Stella at Paris Fashion Week.
The pair watched from front row as the designer displayed her beautiful new creations, with proud dad's big grin indicating his delight.
He even got to his feet as she stepped out for her bow, clapping loudly and cheering.
They joined famous attendees including Salma Hayek, Twiggy and Alexa Chung.
Stella sent down a stunning array of sensual, sportswear-inspired-but-not-themed garments.
She combined the athletic vibe with her signature sheer dresses adorned with strategically placed paillettes - seen on Kate Winslet, Livia Firth and Doutzen Kroes - for a sleeker finish.
photo: © Getty