The 37-year-old has always spoken fondly of her best friend Polly Noble, even more so after she tragically lost her battle with cervical cancer in 2014 aged just 32.
The beautiful blonde revealed that she's keen to keep Polly's spirit alive: 'I try to talk to my daughter about Polly and I will show her photos.
'It was actually on my wedding day, when I was like "I need my friend with me", so I had her name embroidered into my dress, so she walked down the aisle with me.'
Heartbroken. Rest in Peace my darling friend @pollynoble pic.twitter.com/5uPlf2tXrm— Katherine Jenkins (@KathJenkins) May 12, 2014
Appearing on ITV's Lorraine to talk about her Woman Of The Year for Lorraine's annual award ceremony, Katherine made her choice well known.
'Polly was one of my best friends and sadly she had a very long battle with cancer which she lost in 2014,' she said of her pal, who she met when they were struggling singers in 2001.
Taking to Twitter Katherine shared a post just for Polly, the mum-of-one wrote: 'Polly, this is for you - always in our thoughts and hearts. Watch @ITVLorraine this morning, where I'll be chatting from NYC.'
She added: 'Throughout her battle she inspired so many people and changed so many lives. Mine included.'
Polly Noble discovered a lump on her neck in 2010 and, despite undergoing treatment she the discovered she had cancerous cells in her lungs.
Katherine said of her friend's fight: 'It's amazing how she went through this thing that was such a trauma for her. She already beat cancer. But then she called to say it had come back. They had found a tumour on her lymph.'
Talking honestly about Polly's determined attitude, she continued: 'But she told me she was going to create her own lifestyle change to try and beat cancer.'
The singer explained how Polly even wrote a book to help others.
Since Polly's passing in 2014, Katherine has married Andrew Levitas and given birth to their baby girl Aaliyah Reign, who arrived the following year.