The Wolverhampton-born star tweeted an old photo of her mother, Deloris, when she worked at Wolverhampton Eye Infirmary.
She wrote alongside the picture: "Now retired and turned 70 this year just like our NHS in which she had worked since she was 16."
My mum Deloris, #Wolverhampton Eye Infirmary.— Beverley Knight (@Beverleyknight) July 5, 2018
Now retired and turned 70 this year just like our NHS in which she had worked since she was 16.Proud to lend my voice to #WithALittleHelpFromMyFriends by @NHSVoices out tomorrow.
#NHS70 ❤️❤️❤️❤️❤️#windrushgeneration xxx pic.twitter.com/mwQqCdf41f
Beverley, who attended Highfields School in the city, is also one of the many celebrities singing in a new version of Beatles classic With A Little Help From My Friends.
The track has been re-recorded with famous singers and NHS staff alike to mark seven decades since the NHS launched.
Beverley shared the good news on Twitter, saying: "My luvs, I am so happy to be one of many artists and NHS staff today recording a few lines for a new version of the Beatles classic With A Little Help From My Friends."
The song came out on Friday, the day after the NHS turned 70.
Other stars who helped with the recording were Blue, The Saturdays’ Una Healy and Girls Aloud’s Kimberley Walsh.
Joining them were Myleene Klass, Tony Hadley, Coleen Nolan, Elbow’s Guy Garvey, Marina and the Diamonds and JLS’s Aston Merrygold.
Members of South London’s Lewisham and Greenwich NHS choir then assisted in recording the song, after Sir Paul McCartney gave permission for the track to be re-released.
Its aim is to soar straight to number one, with any proceeds to go to NHS Charities Together - an organisation which raises funds for medical equipment and research the health service cannot afford.
The song was filmed by ITV and will be featured in a 90-minute show next month.
The NHS choir last topped topped the charts at Christmas in 2015 with A Bridge Over You, a mash-up of Simon and Garfunkel’s Bridge Over Troubled Water and Coldplay’s Fix You.
The choir’s mastermind, NHS communications worker Joe Blunden, said: “We are determined to get to No1 again.
“I never expected the recording to be so moving. You could tell everybody was really passionate about the NHS and really had a reason to be singing with us.
“It was also a fantastic moment for members of the NHS choir who got to meet their musical heroes.”