Rosie Smith, the only daughter of the Gorbals-born telly host, 64, and husband Steve Smith, announced her engagement to partner Steve White.
The touching news was shared in a heartfelt Instagram post showing a selection of photos of Rosie sitting at a table wearing an engagement ring.
READ MORE: Lorraine Kelly has ‘lovely time’ at Glasgow restaurant on break from ITV show
She wrote: “There are too many lovely things going on and I’m not quite sure what to do with myself.
“Everyone always told me you’ll know when it’s about to happen but I had absolutely no idea.”
Lorraine commented on the post: “So happy – it’s such lovely news and I will have a son as well as a granddaughter.”
READ MORE: Lorraine Kelly has praised one of Taylor Swift’s dancers
TV doctor Amir Khan and presenter Christine Lampard offered their congratulations.
It comes after Rosie announced she and Steve were expecting their first child together.
In April, Lorraine posted a photo of Rosie’s ultrasound on her Instagram and said she “cannot wait to be a granny.”
The mother and daughter host a podcast together called What If?, in which they discuss life’s defining turning points with celebrity guests.