The actress, 62, and her offspring Gaia, 21, laughed raucously as they posed at the event organised to raise money for NHS charities.
Star of the silver screen Emma dazzled in her outfit, wearing a black jumpsuit beneath an oversized gold shimmering jacket, while Gaia donned a sparkly purple jumpsuit which she teamed with a matching floral and gold fascinator on her head.
Emma’s husband Greg, 55, looked dapper in a black jacket and trousers which he teamed with a white top.
The trio were seen posing together and Emma grinned broadly as her beau pointed at her at the bash.
Gaia could be seen standing between them in her outfit which featured a very daring neckline, with a long silver necklace hanging in between.
She sported a pair of long pendulum earrings which featured green and purple beads.
Actor Greg is set to take place in Strictly Come Dancing when the new series star on Saturday.
This week he told how wife Emma insisted he take part, with the couple cancelling their first holiday together in seven years so he could appear on the BBC ballroom dance contest.
Greg, who married Emma in 1992 after they co-starred in Sense and Sensibility, told MailOnline: ‘I told my dear lady wife when they asked me and I said no and she said ”you’re mad you’ve got to do it!”
‘She’s been filming solidly since January and she finishes her last film tomorrow. We were going to have her first holiday together in seven years, but over the five minute conversation the autumn was kicked into the grass and she’s thrilled she’ll be able to relax and support me.’
Greg also revealed that he has spoken to his pal, and Strictly 2020 winner, Bill Bailey about taking to the dancefloor, after the comic wowed viewers and scooped the glitterball with Oti Mabuse last year.
He said: ‘When I was first asked to do I contacted him and he said ”you’ve got to look after your feet” and I’m interested in working hard and trying something completely new and seeing if this body will do what’s asked of it.
‘One of the things I’ve done is get my patent ballroom shoes ready because I think he had quite a problem with blisters, I think it was known as shoegate, I’m trying to get my feet as hard as possible.’
Greg had previously revealed that he decided to sign up for the show as a tribute to his late sister, adding that she was a real ‘disco diva’ who adored the primetime show.
He told MailOnline: ‘I was asked and I thought ”no absolutely I can’t do it,” and then I thought about it, and almost exactly five years after my sister died we’ll be doing our first routines.
‘My sister was a real disco diva she was the dancer in the family and she left this world in a glitterball coffin, so as this world is all glittery I have to go it for her.’
Strictly Come Dancing returns on Saturday 18th September on BBC One.