The 'Modern Family' star approves of her on-screen aunt's new man, as she already knows him from when he appeared with her in supernatural drama series 'Medium'.
She told UsMagazine.com: ''I think they are super hot together. I know Joe, and he is divine.
''He played my boyfriend's dad in an episode of 'Medium', so we've known him for quite some time. He's just an amazing person, and I love them individually. So him and Sofia together, I'm all for it! They'd make really hot babies!''
Sarah's sentiment is echoed by another of their co-stars, Julie Bowen, who thinks the celebrity couple are ''too good looking''.
She said: ''You know it almost is like a genetic explosion and there might not be enough diversity in the gene pool because they are just too good looking.''
Sofia, 42, split from businessman Nick Loeb in May and started dating 'True Blood' hunk Joe in June.
While they are dating, the pair are said to be taking their relationship slowly as an insider recently revealed: ''It's very, very new. They're having fun and getting to know each other.''
Take a look back at October's inaugural event.
The film is expected to continue without Mendes' involvement.